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The Big Bang Theory (2007-2019) was a long-running CBS sitcom about four nerdy CalTech scientists (the insecure Leonard Hofstadter, the severely empathetically challenged Sheldon Cooper – who fancies himself a kindred spirit to Spock and Data since childhood – , the sexist, yet also mama's boy Howard Wolowitz, and the feminine but lovelorn Raj Koothrappali) and the hot promiscuous girl Penny who lives across the hallway and whom Leonard carries a torch for.

Being passionate comic book collectors, the four scientists are also rabid science fiction fans and collectors of memorabilia, Star Trek and Star Wars in particular, resulting in a constant flow of Star Trek references throughout the entire run of the show, particularly in its middle seasons. Other franchises the four are fans of include, among others, Stan Lee's Marvel Comics universe, Ronald D. Moore's Battlestar Galactica, and the British Doctor Who and Red Dwarf franchises, also referenced on the show, albeit far less frequently than Star Wars and Star Trek. Of all the Star Trek live-action incarnations, Star Trek: The Original Series, Star Trek: The Next Generation, and their derivative Star Trek films are the most frequently referenced, with the others barely touched upon, if at all – specifically Star Trek: Enterprise in the latter case. This in itself is reflective of the status these two productions hold in the awareness of the general (non-fan) populace. Similarly, Star Trek II: The Wrath of Khan is the most referenced film, likewise reflecting its status.

A major recurrent secondary character on the show is the socially awkward and consistently strapped-for-cash Stuart Bloom, owner of the comic book store the four protagonists frequent, and who, in an instance of cross-fertilization, has the in-universe animal Stuart named after him. (AT: "Choose Your Pain") Earlier, Raj had the "Koothrappali Astrophysics Review" named after him, seen in TNG-R: "Redemption II" (the 2013 remastered version, meaning Raj could have seen the homage for himself while The Big Bang Theory was still on the air – as Stuart could have done for that matter), where it had been retconned onto a viewscreen aboard the USS Sutherland.

Recurrent guest stars on the show include Brian George and Keith Carradine as Raj's and Penny's fathers, Pasha Lychnikoff as a cosmonaut on the International Space Station, Mark Harelik as the CalTech physics department chairman Gablehauser, and Jerry O'Connell as Sheldon's older brother George, Jr., with Stephen Hawking as himself. Star Trek actors Wil Wheaton, Leonard Nimoy, George Takei, LeVar Burton, Brent Spiner, and ultimately William Shatner all made appearances on the show, as fictionalized versions of themselves, in Wheaton's and Burton's cases recurrent ones. Cast member Kaley Cuoco ("Penny") also played Shatner's daughter in commercials, starting in 2013 while The Bang Theory was in its sixth season, [1] and Iris Bahr appeared in the original unaired pilot for the show. Non-performing alumni with formal Star Trek ties who made (cameo) appearances as fictionalized versions of themselves included D.C. Fontana, David Gerrold, Adam Nimoy, Neil deGrasse Tyson, Elon Musk, and Stan Lee, the latter four in speaking parts.

Both the The Big Bang Theory and Star Trek franchises are (in part) owned by CBS Corporation, as is the 2017 spin-off prequel series Young Sheldon. Unlike the CBS-era Star Trek television productions though, The Big Bang Theory and its spin-off are produced on behalf of CBS by Warner Bros., which is therefore the end-owner of that franchise, like NBC and Desilu/Paramount Pictures had been in the Original Series era. To this day NBC still receives a residual income stream from the Original Series – predominantly from the syndicated airings and streamings – as CBS will from the The Big Bang Theory franchise.

When The Big Bang Theory concluded its twelve-season run in 2019, it was officially reported by a proud CBS as the longest running multi-camera sitcom in US television history, [2] [3] though it was not the longest running live-action comedy series. [4]


Generic Star Trek references

Miscellaneous Star Trek merchandise

Even when Star Trek was not directly referenced to in the individual episodes, a multitude of its merchandise from various manufacturers was featured throughout the entire series as either props (most notably uniforms and handheld props, thereby constituting something akin to product placement), background set dressings in the homes of the four scientists or as merchandise in Stuart Bloom's comic book store. This merchandise originated from the archives of CBS Consumer Products, where it is habitually kept. Merchandise that is identified and/or warrants further attention is addressed in their respective individual episode entries, listed below.

"Wild Stacks" video slot machine

In 2015 Australian gaming developer Aristocrat launched a three reel slot machine called "Big Bang Theory Slot Game". One of the payout symbols is a small pile of Star Trek: The Next Generation comic books. [5]

Leonard Nimoy homage

Leonard Nimoy tribute

Upon the the passing of Leonard Nimoy in February 2015, The Big Bang Theory paid tribute to the Spock performer in the season 8 episode "The Colonization Application", aired on 11 April 2015, by closing out with a final end title card that read "The impact you had on our show and on our lives is everlasting."

Aside from being referenced to on numerous occasions in prior (and later) episodes of the show, both as performer as well as his Spock alter ego, Nimoy had already made his voice-over appearance on the show in the season 5 episode "The Transporter Malfunction" which had aired on 29 March 2012.


Original unaired pilot

Gilda says that she slept with Sheldon because of his completely accurate pon farr imitation, to which Sheldon responds with the Vulcan salute.

The Big Bang Theory has actually mimicked the history of the television show it later referenced so much; like The Original Series, the original pilot was rejected by CBS, and the producers were asked to produce a reworked second one, which was picked up. [6] Incidentally, CBS declined to pick up Star Trek back in 1964, after which it went to NBC, which also rejected its original pilot at first, "The Cage". Unlike The Big Bang Theory though, that pilot was aired, albeit re-edited as a the two-part "The Menagerie, Part I" and "The Menagerie, Part II" episodes.

Season 1 (2007-2008)

"The Cooper-Hofstadter Polarization" (Ep. 09)

A presentation of a scientific paper by Leonard at a science conference goes awry, when co-author Sheldon who had opposed the presentation, starts an altercation with Leonard during which he threatens Leonard with a "Vulcan Nerve Pinch".

"The Loobenfeld Decay" (Ep. 10)

Penny is reconsidered for a part in the musical Rent and prepares for it by rehearsing singing the songs for the part. She invites Leonard and Sheldon to her performance, but they, horrified by the appalling quality of her singing, go out of their way to make up excuses for not going.

The actual 1996 Rent musical would later gain some infamy in "Trekdom", when one of its songs ("Seasons of Love") was adapted in January 2019 into an one-minute homage clip made for streaming on the Apple TV+ app, in which the uniform-clad Star Trek: Discovery primary cast were singing the song (equally appalling according to many) on its bridge set, profusely thanking the "nerds" – "nerds" being emphasized with flashy, sing-along captions, repeatedly – for keeping the franchise alive for all these decades. Part of he fanbase was not amused, to put it mildly. (see:DIS Season 2: Reception)

"The Pancake Batter Anomaly" (Ep. 11)

Sheldon and Leonard play three-dimensional chess.

While the chess set – making additional show appearances later on – looks very similar to the official 1993 release from Franklin Mint, sharp-eyed viewers might notice that the set differs in detail from the Franklin release, and is actually the more accurate replica of the original as used in the Original Series.

"The Bat Jar Conjecture" (Ep. 13)

The episode begins with Howard announcing new info on the then-upcoming Star Trek film, which leads into a discussion about alien private parts and Spock's conception. Later Sheldon is persuaded to join in the Physics Bowl by quoting Spock's dying words. Sheldon "designs" shirts for his own Physics Bowl team, which bear an "uncanny" resemblance to TOS-style uniforms, with his teammates clad in red shirts and being otherwise prohibited to speak up during the contest, whereas Sheldon wears a command-gold shirt and is the only one allowed to answer questions – which had been the reason why he was ousted from his friend's team to begin with. Ultimately in the final scene, to satisfy who is smarter between Leonard and Sheldon, Penny asks multiple real-world questions for which they are only able to give Star Trek-like answers, including Patrick Stewart or William Shatner being the Sexiest Man Alive and Tweety Bird thinking he saw a Romulan.

"The Nerdvana Annihilation" (Ep. 14)

The guys purchase a full-scale time machine prop replica from the film The Time Machine and they decide to play with it. They wonder what time date to travel to and Sheldon suggests to Leonard that he should travel to the future to obtain a cloaking device and references "The Enterprise Incident". Sheldon gives the stardate of this episode as 5027.3, which supposedly converts to January 10th, 2328.

When a grumpy Penny viciously chides the boys for their "childish" passions, Leonard decides to get rid of his memorabilia collection, sparking an immediate fight among the three others over ownership of Leonard's possessions. When the fight starts to escalate, Leonard threatens to open up a Geordi La Forge action figure that's still in its original packaging. During the altercation, Howard is wearing a shirt that resembles a Starfleet Academy uniform and wears an enlistee/chief engineer's pip on the collar of his undershirt as rank insignia.

While Sheldon has given the correct stardate, traditionally the episode is placed in 2268. Howard wearing a TNG-style chief engineer's pip, seen in several later episodes as well, reflects his engineering job at CalTech; he is the only one not to carry an academic doctor's degree (becoming a running gag throughout the entire series as a source of derision for Sheldon), much like Chief Miles O'Brien was a Starfleet NCO and not an officer on Star Trek: Deep Space Nine.
The iconic time machine prop had originally been a design by Wah Chang, famed for his later contributions to Star Trek: The Original Series, a replica of one of them – besides the tricorder and the Gorn – turning up in the later "The Good Guy Fluctuation" episode. In dialog Leonard alludes to his La Forge action figure as being the rare production error version (highly valued by collectors) of the already rare 1992 first La Forge release by Playmates Toys (No. 6015), and constitutes a prime example on how well versed the series' writers are on what occupies the minds of Star Trek fans and collectors. Incidentally, the big production staff "Trekkie" has been the show's Co-Creator/Co-Executive Producer Bill Prady, and he is as such included in several chapters as an interviewee on Roger Lay, Jr.'s 2016 Star Trek: The Journey to the Silver Screen 50th anniversary documentary.
Penny's stance – very reminiscent of William Shatner's (in)famous 1986 "Get a Life!" rant on Saturday Night Live – on the boy's fandom passions serves for the first time as a proxy for the perception the (non-fan) general populace at large has of "Trekdom", as already indicated by the episode's title, though she will refrain from expressing her opinions this viciously later on in the series, already in the episode itself at a later point.

Season 2 (2008-2009)

"The Bad Fish Paradigm" (Ep. 01)

Leonard compares his dating a woman to Raj and Howard's not dating anyone as "approach is warp speed." Later, Sheldon asks Penny if she speaks Klingonese.

"The Codpiece Topology" (Ep. 02)

Sheldon Cooper dressed as Spock

Sheldon Cooper goes to a Renaissance fair dressed up like Spock pretending he's on a planet with a Renaissance theme due to the fair's complete disregard for historical accuracy.

The tricorder Sheldon is carrying at the end of the episode had been a pre-release evaluation toy product from Diamond Select Toys. The commercial version was released nine months later in June 2009. [7] The toy went on to become set dressing in Sheldon's bedroom.
Toy company Bif Bang Pow! released Sheldon-as-Spock action figures in 8" (October 2014 as homage to the 1970s Star Trek action figure line from Mego [8]) and 4" (June 2016 on the occasion of Star Trek's 50th anniversary [9]) sizes, along with the rest of the primary cast in Starfleet cosplay in both scales. This also included Amy's nurse outfit, she wore in the later season 5 episode "The Launch Acceleration". Apart from Sheldon and Amy, none of the others have actually been seen wearing Original Series uniforms over the course of the show, though Leonard is referenced on several occasions of owning two Captain Kirk uniforms, whereas Raj is mentioned of owning an Uhura dress. Incidentally, and concurrent with the 2014 8" figures, the company also released a 8" set of the four male characters dressed in their medieval cosplay outfits they wore in the episode. [10]

"The Euclid Alternative" (Ep. 05)

When Penny drives Sheldon to work, he annoys her by continuously criticizing her driving style. When a thoroughly irritated Penny rebukes him, Sheldon seemingly drops his attitude by stating, "You have the conn" – even though he has no intention whatsoever to do anything of the sort.

While Sheldon's expression is commonly used nautical parlance, it is also frequently used throughout the entire Star Trek live-action franchise. Considering Sheldon's fanboy background, it is therefore more than likely that he is referencing its Star Trek use.

"The Panty Pinata Polarization" (Ep. 07)

Klingon Boggle next to a Klingon dictionary

The gang plays Klingon Boggle, with a copy of The Klingon Dictionary on hand. Howard claims that the Yiddish culinary dish kreplach is also a hearty Klingon dumpling.

"The Lizard-Spock Expansion" (Ep. 08)

Sheldon expands the game of Rock-Paper-Scissors with additional options of "Lizard" and "Spock," the latter symbolized by the Vulcan live-long-and-prosper hand gesture. It was used initially to determine whether or not to watch Star Trek: Deep Space Nine. Later, Sheldon and Raj argue whether Star Trek: The Motion Picture or Star Trek V: The Final Frontier is the worst Trek movie, and whether Star Trek II: The Wrath of Khan or Star Trek IV: The Voyage Home is the best.

"The White Asparagus Triangulation" (Ep. 09)

Sheldon compares Dr. Stephanie Barnett as the Leonard McCoy to their social group's "landing party" (Leonard is Kirk, Sheldon is Spock, Wolowitz is Scotty, Koothrappali is a redshirt) and gives a somewhat off version of the Vulcan salute when he notices her observing the conversation. He later tries to relieve Leonard of duty with Starfleet general order 104, section A. Leonard argues that it won’t work because they aren’t on Star Trek.

"The Cushion Saturation" (Ep. 16)

Sheldon shoots Penny at the weekly paintball expedition before the game has even started in retaliation for Penny having accidentally shot his favorite cushion with a paintball gun earlier. When asked why he would do this, Sheldon paraphrases Khan, stating that "revenge is a dish best served cold".

"The Bath Item Gift Hypothesis" (Ep. 11)

Penny gives Sheldon a used napkin autographed by Leonard Nimoy as a Christmas present. She apologizes because Nimoy wiped his mouth with it, but a more than overjoyed Sheldon is even more grateful, as now he has Nimoy's DNA, claiming he now will soon be able to "grow" a Leonard Nimoy for himself.

"The Dead Hooker Juxtaposition" (Ep. 19)

Ostensibly on their behalf, Penny is addressing a newly arrived pretty female neighbor, who is manipulating Leonard, Howard and Raj into performing all kinds of chores for her, and compares the boy's social naivete regarding their inability to withstand the manipulation by pretty women, to not knowing how to put up their shields like on Star Trek. The reference is completely lost on the new arrival, who continues her manipulation unabated, much to the chagrin of a jealous Penny, who no longer has all the exclusive attention she hitherto had.

"The Hofstadter Isotope" (Ep. 20)

Sheldon says Leonard had been watching "Trials and Tribble-ations" by describing it as "the Deep Space Nine/Star Trek: The Original Series "The Trouble with Tribbles" crossover episode."

"The Vegas Renormalization" (Ep. 21)

Sheldon's frequent answer of Spock during Twenty Questions.

"The Classified Materials Turbulence" (Ep. 22)

Leonard says that Howard's zero-gravity toilet for the International Space Station will allow its crew "to boldly go where no man has gone before."

Season 3 (2009-2010)

"The Electric Can Opener Fluctuation" (Ep. 01)

Penny references Star Trek as part of her comforting of Sheldon after he learns Leonard, Howard, and Raj had faked his discovery of magnetic monopoles in order to keep him happy. Sheldon wears a goatee resembling the one Spock wears in TOS: "Mirror, Mirror". A recurring joke is Sheldon's "damned Vulcan hearing."

"The Creepy Candy Coating Corollary" (Ep. 05)

Leonard says that Howard can speak five languages, and Howard says, “Six, if you count Klingon.” Sheldon states he used to be a Wil Wheaton fan until Wil abruptly pulled out of a convention Sheldon had traveled ten hours by bus to attend and get his autograph. During a customizable card game tournament Wil is participating in, Sheldon constantly quotes Khan Noonien Singh from Star Trek II: The Wrath of Khan, uttering the proverb "Revenge is a dish that is best served cold" in original Klingon. When Wheaton tricks Sheldon out of a sure victory, Sheldon cries out "Wheaton" to the heavens, in imitation of Kirk's "Khan" cries in The Wrath of Khan.

"The Adhesive Duck Deficiency" (Ep. 08)

Trying to get Sheldon to drive faster, Penny says, "warp speed ahead, Mr. Spock", to which Sheldon replies that that order would never be given to the science officer, but to the navigator/helmsman instead.

The first time Sheldon refers to himself as "science officer" verbally; he does so again in the later "The Bus Pants Utilization" and "The D & D Vortex" episodes.

"The Maternal Congruence (Ep. 11)

When Leonard asks what he truly wants, Sheldon answers, "What I want is to be departing on the starship Enterprise in a one-man shuttlecraft headed for the planetoid I rule, known as Sheldon Alpha Five."

Sheldon is of course paraphrasing Khan's rule over Ceti Alpha V.

"The Bozeman Reaction" (Ep. 13)

Sheldon moves to Bozeman, Montana, which is where the Phoenix had been launched, after the apartment is burglarized. He says "Live long and prosper" and gives the Vulcan salute in a farewell video.

"The Large Hadron Collision" (Ep. 15)

In order to persuade Leonard, who is planning to take Penny along as a Valentine's Day gift, to take him instead to the CERN Large Hadron Collider in Switzerland, Sheldon goes even as far as allowing Leonard to watch Babylon 5. Prohibited to be seen by Sheldon, Leonard loves the series but had until then lost each and every argument they had over it. However, Sheldon is so desperate to go to CERN that he purports to set aside his disdain for the series, even though it, according to him, "(...)failed as drama, science fiction and is hopelessly derivative".

While Star Trek is not directly referenced to in this episode, it is indirectly, as Sheldon in his snarky remark refers to the fierce competition that had existed at the time between Babylon 5 and Deep Space Nine, in the process implicitly accusing the former of plagiarizing the latter.
Ironically, Babylon 5 had been produced by the same production company that produced The Big Bang Theory, Warner Bros.

"The Excelsior Acquisition" (Ep. 16)

Sheldon reveals that Leonard Nimoy took a restraining order out against him after receiving one from Stan Lee. Additionally, when Leonard is asking Penny to guess who Stan is, she incorrectly assumes he was on Star Trek.

Penny was not entirely wrong though, as Stan Lee did have formal Star Trek ties in his role as comic book creator.

"The Precious Fragmentation" (Ep. 17)

Howard says he knows a guy who can obtain black market phasers and panties worn by Nichelle Nichols on the show.

Uhura actress Nichelle Nichols and co-star Walter Koenig have been the only then-still living Original Series primary cast members not to make a guest appearance on the show.

"The Pants Alternative" (Ep. 18)

Assuming he was passed over for a science award, Sheldon compares himself to the William Shatner of science after musing why Shatner was not in Star Trek, the 2009 alternate reality film. When Sheldon learns that he is the recipient of the award after all, he immediately reverts to his self-absorbed self again, causing Howard to scoff, "Yeah, the one thing the William Shatner of theoretical physics needed was an ego boost." [11]

Shatner had actually been considered by the producers of the film, but they could not figure out a plausible way around the fact that Shatner's Kirk had died at the end of Star Trek Generations. (Star Trek: The Compendium: "To Boldly Go" special feature)
Howard's scoffing remark refers to Shatner's well known character trait to put himself front and center, already in his Original Series days, as related by more than one contemporary collaborator, among others John Crawford. Shatner's conflicts over this with his fellow Original Series co-stars Nichols, Doohan, Koenig and Takei have been abundantly and profusely reported upon by the Hollywood tabloids over the decades.

"The Wheaton Recurrence" (Ep. 19)

Wil Wheaton returns for a bowling game. Sheldon names their team "The Wesley Crushers", but Penny does not get the reference. Later, Howard asks Wil if he had sex with Whoopi Goldberg.

"The Staircase Implementation" (Ep. 22)

As part of Sheldon's "first barrier to roommatehood," he asks Leonard "Kirk or Picard?" Leonard replies "Original Series over Next Generation, but Picard over Kirk."

"The Lunar Excitation" (Ep. 23)

As Howard and Raj, having secretly signed Sheldon up with an online dating service, try to convince him to at least meet the woman he has been matched with, Raj reminds him that even Spock dated once every seven years, so Sheldon quickly shoots back that pon farr had nothing to do with dating: "His blood boiled with mating lust".

Season 4 (2010-2011)

Season 4 promotional ads

In one, Sheldon builds an Original Series transporter to beam them (with Next Generation-style visual effects) from their old Monday night time slot to Thursday. In another he and Leonard again play three-dimensional chess while discussing the move.

"The Hot Troll Deviation" (Ep. 04)

The science fiction icons lamenting being typecast

Howard has a USS Enterprise-D model in his bedroom. An imaginary George Takei (wearing his Hikaru Sulu costume from Star Trek IV: The Voyage Home) appears to give Howard romantic advice. Likewise, actress Katee Sackhoff appears as her Battlestar Galactica counterpart, for whom Howard has the hots, and starts bickering with Takei, questioning his credentials to give Howard romantic advice, while poking fun at Takei's homosexuality. Both however, are also lamenting and exchanging notes on being typecast as Sulu and Starbuck respectively.

The Battlestar Galactica science fiction franchise itself has many, predominantly behind-the-scenes, connections with Star Trek, and the 2003 and beyond revamped version, in which Sackhoff performed, was produced by Ronald D. Moore and his Star Trek: Deep Space Nine writing staff. Sackhoff had already appeared as a figment of Howard's overheated imagination in the prior episode "The Vengeance Formulation" (S03E09).
The Enterprise-D model is the 1994 "Battle-damaged" version (No. 6171) from the Playmates Toys starship line, and continues to turn up in several subsequent episodes as part of the standing set.

"The Apology Insufficiency" (Ep. 07)

Taken as proof that he has wronged Howard, Sheldon is dreaming of a Gorn sitting on the couch reading a magazine. He later compares his problem of Howard refusing to accept his apology with the no-win Kobayashi Maru scenario, and is impressed by Penny's knowledge that Kirk cheated on the test, enticing him to try something similar on Howard. Later he is introduced by Raj to the visiting Neil deGrasse Tyson at CalTech, but Sheldon scolds him for his part in the declassification of Pluto from a planet to dwarf planet, and refuses to accept his apologies for it later on, stating that Tyson needs "to get over himself".

The astrophysicist – thus a colleague of Raj in the show – and cosmologist Tyson in his first appearance on the show had actually played an active role in the demotion of Pluto, and Sheldon's reaction reflected the emotions many people, especially children, in effect felt at the time when the decision, influenced by Tyson's activism, was made formal in 2008 and reinforced in 2008. He made a second appearance on the show in the later episode "The Conjugal Configuration" (S12E01), that otherwise did not contain any other Star Trek references, besides being occasionally referenced to himself in other episodes.
Tyson became formally tied to the Star Trek franchise relatively late, when he was quoted ad verbatim by Spock in the 2019 Star Trek: Discovery season two finale "Such Sweet Sorrow, Part 2".

"The 21-Second Excitation" (Ep. 08)

Leonard mentions how they all waited fourteen hours to see Star Trek Nemesis, also relating how he had to fight a "Klingon" during the wait, the ordeal only aggravated by the fact that they had to watch the "terrible movie" afterwards. Later, when Wil Wheaton – deemed the Jar Jar Binks of the Star Trek universe by Sheldon – jumps the line to see Raiders of the Lost Ark, Sheldon quotes Picard's "The line must be drawn HERE!" line from Star Trek: First Contact.

Appearing in the first trilogy of the Star Wars main saga, Jar Jar Binks is a character particularly despised by the Star Wars fan base.
Likewise, and only receiving a reference in this one episode, Nemesis was very poorly received by the fanbase at the time, remaining the all-time worst performing one of all thirteen Star Trek films as of 2020.

"The Boyfriend Complexity" (Ep. 09)

Sheldon comments that he doesn't care for novelty editions of Monopoly, preferring the regular and Klingon editions.

Howard and Raj play a game of Star Trek-themed battleships. When Howard notices that two squares are a hit but the one in the middle is a miss, Raj comments that his starship has a hole in the middle. When asked what starship has a hole in the middle, Raj says "a Romulan battle bagel."

Mentioning the Star Trek Klingon Edition Monopoly constituted something of an anachronism, or conceivably an instance of product placement, as that particular version had not yet been released by the time the episode was originally aired in November 2010. The game was released one year later, almost to the day.

"The Alien Parasite Hypothesis" (Ep. 10)

Sheldon suggests that Amy use kolinahr to suppress her newfound sexual arousal after asking her if she'd seen Star Trek: The Motion Picture and then says not to.

"The Bus Pants Utilization" (Ep. 12)

Sheldon's passive-aggressive stance against the guys for kicking him out of their app design team includes playing the Original Series theme on a theremin. Before he was kicked out Sheldon listed himself as the "Star Trek science officer" of the design team.

"The Love Car Displacement" (Ep. 13)

Leonard uses the Romulan Neutral Zone as a metaphor for how he and Penny will share a bed without becoming intimate. When he suggests they do get intimate in the context of how often the Neutral Zone was entered by both the Federation and Romulan Star Empire, Penny says she's raised shields over the lower half of her body.

"The Thespian Catalyst" (Ep. 14)

Sheldon and Penny act out a fan fiction story he'd written as a child where he's whisked away to the 23rd century, with Penny playing Spock. She perfectly executes the hand salute at one point.

"The Toast Derivation" (Ep. 17)

Sheldon invited LeVar Burton over to the apartment via Twitter. At the end of the episode, he sticks his head in and gets too weirded out by the sight of three other guys singing karaoke. He then leaves and says he's so done with Twitter.

"The Prestidigitation Approximation" (Ep. 18)

Leonard says to Priya that the only Star Trek uniforms he has are the everyday and dress ones from the Original Series, when she peruses trough his wardrobe closet, coming across them. She then reveals that Raj has an Uhura dress, much to the family's alarm and dismay, when Leonard suggests she wear one.

Among the many science fiction memorabilia Leonard keeps in his bedroom besides the uniforms, is a 6, or 7" display figurine of Captain Kirk on his night dresser, as well a smaller Star Trek bust on his cubbard.

Unlike the uniforms, the fleetingly seen Star Trek merchandise was only discernible in this episode, and as of yet unknown from which company they originated. In a previous episode it was revealed that Leonard also owns an original series Battlestar Galactica flight suit.

"The Zarnecki Incursion" (Ep. 19)

Sheldon carries a bat'leth with him to the house of the guy who hacked his World of Warcraft account.

"The Agreement Dissection" (Ep. 21)

Sheldon cites "Let That Be Your Last Battlefield" as his inspiration for blackmailing Leonard into signing a new roommate agreement that greatly favors him, after the law graduate Priya has taken apart the previous version. He then shows an okudagram-styled auto-destruct-esque countdown timer on his laptop showing how much time Leonard has before Priya's parents are emailed about her dating Leonard, causing Priya to buckle. Sheldon then tells her that while she may have gone to the Faculty of Law at Cambridge University, he's an honorary graduate of Starfleet Academy.

"The Wildebeest Implementation" (Ep. 22)

Sheldon's three-player variation of chess includes a space designated as a transporter pad.

"The Roommate Transmogrification" (Ep. 24)

Raj overhears Leonard and his sister Priya having an Original Series-themed sex fantasy.

Season 5 (2011-2012)

"The Russian Rocket Reaction" (Ep. 05)

Star Trek alumni in "The Russian Rocket Reaction"

Wil Wheaton throws a party at his house, which has a painting of him as Wesley Crusher in uniform and an Enterprise-D model. Raj says he talked with Alice Krige's gynecologist, referring to Alice as "The Borg Queen From First Contact." Wil gives Sheldon an autographed still-in-package Playmates Toys Wesley action figure, but Brent Spiner promptly opens it upon seeing it. Brent then offered Sheldon a autographed still-in-package Data action figure to make up for it, but Sheldon declines and declares Spiner as his new mortal enemy. The other boys though, manage to negotiate Spiner down on the price of his action figure from twenty dollars to two for fifteen and a promise that Spiner will attend a birthday party.

In the background at the party are Star Trek writers D.C. Fontana and David Gerrold. They can be seen talking with Kevin Sussman, who plays the show's recurrent secondary character Stuart Bloom, the comic book store owner.
The street address of Wil Wheaton's house (as seen on the front porch as the gang arrives at the party) is 1701.

"The Rhinitis Revelation" (Ep. 06)

There's a Next Generation science tricorder displayed in the bookcase behind the couch.

This either concerned the functional 2003 limed edition of the TR-590 tricorder Mark IX replica from Master Replicas, or its equally functional 2009 upgraded reissue by eFX Collectibles.

"The Good Guy Fluctuation" (Ep. 07)

Dispelling his claim that he is too intelligent to be surpised by Halloween pranks, Sheldon is literally scared senseless when Leonard does surprise him wearing a Balok mask.

Featured in TOS: "The Corbomite Maneuver", the Balok puppet was an original creation by the same Wah Chang, who had designed the iconic time machine featured in the previous season 1 episode "The Nerdvana Annihilation".

"The Ornithophobia Diffusion" (Ep. 09)

While the two are on a date in a bar, they start bickering and Penny tells a girl that Leonard owns two Star Trek uniforms and that he wears them outside the Halloween holidays as well.

"The Recombination Hypothesis" (Ep. 13)

Sheldon ordered a life-size cardboard standee of Spock for his room, but the company sent him the wrong version, prompting him to snarl "Live long and suck it, Zachary Quinto!" – despite Leonard reminding him that he had liked Quinto as "Sylar" in Heroes.

Like the show itself, the by NBC aired science fiction series Heroes (2006-2010) had contained many Star Trek references.
The Spock cardboard standee was a 2009 product from company Cardboard People and could be ordered through a number of retailers, including and Walmart. [12]
Sheldon's aversion of Quinto as Spock, was in itself the show's far-from-subtle reminder that the 2009 relaunch of Star Trek in the alternate reality had started to cause a rift in the hitherto more-or-less homogeneous "Trekdom"; while the younger generations of moviegoers liked the (first two) films, the traditional Roddenberry/Berman-era fan base had far more trouble accepting the re-imagined franchise. The "generations" rift became even more pronounced with the advent of Star Trek: Discovery in 2017 and beyond. (see also in this regard: Discovery Season 2 – Reception)

"The Vacation Solution" (Ep. 16)

Bernadette had rejected Howard's suggestion to have wedding invitations in Klingonese. Sheldon later mentions in passing that Carl Sagan is yet another celebrity who has taken out a restraining order against him.

It will be revealed in the spin-off series that Sheldon in his youth had been a passionate fan of Sagan's acclaimed 1980 science docu-series Cosmos: A Personal Voyage.

"The Rothman Disintegration" (Ep. 17)

Kripke has Sheldon explain Rock-Paper-Scissors-Lizard-Spock to him at least three times to mess with him. Sheldon later proposes a trivia contest with The Original Series, The Next Generation, Deep Space Nine, and Voyager being four of the five categories.

Sheldon not including Star Trek: Enterprise is a subtle reminder on how poorly received the series was at the time by the fan base; the series is the only one of the Berman-era never mentioned by name on the show.
Additionally, Star Trek: The Animated Series has never been referenced to on the show either, itself a reminder that fandom and even creator Gene Roddenberry did not consider it as part of established Star Trek canon, a stance still adhered to by a substantial part of "Trekdom", despite the official elevation as such by the franchise as of 2006, after Roddenberry had died. The Animated Series though, became eventually referenced in the spin-off series Young Sheldon.

"The Weekend Vortex" (Ep. 19)

Amy mistakenly refers to the Star Wars video game the guys are playing as a Star Trek video game. Penny corrects her, saying the guys don't like when the two franchises are mistaken for one another, even though Penny, as far as she herself is concerned, does not perceive any difference between the two either.

The matter of being unable to distinguish between Star Trek and Star Wars came up again in the later "The Military Miniaturization" episode.

"The Transporter Malfunction" (Ep. 20)

"Spock toy" enticing Sheldon to play with his transporter toy

Penny bought Sheldon and Leonard a mint-in-box 1975 Star Trek transporter toy each. However, they refused to play with them as the toys would lose some of their perceived value within toy collector circles. That night, Sheldon dreamed that his Mr. Spock action figure told him that it was illogical to own a toy that he wouldn't play with. Shortly afterwards, Sheldon accidentally broke his transporter while playing with it and then replaced it with Leonard's. Later, he had a nightmare about being chastised by Mr. Spock about his actions and was subsequently attacked by a Gorn. Appropriately chastened, Sheldon confessed his guilt to his roommate.

The Spock action figure is actually voiced by Leonard Nimoy.
Both the transporter toy and the Spock action figure were products from the toy company Mego, although the separately-boxed transporter was actually only available in the UK, through the sub-licensed Palitoy company.
An excerpt of the episode became featured itself in the May 2018 "Star Trek" episode of the Netflix documentary series The Toys That Made Us in the section dealing with Mego.

"The Hawking Excitation" (Ep. 21)

Howard says "no" in Klingonese when telling Sheldon that he wouldn't introduce him to Stephen Hawking.

Making his first of seven appearances as himself in the series, Hawking had already done so in 1993 in the Next Generation episode "Descent".
In yet another expression of his disdain for the series, it was also divulged that Sheldon had begged TNT up to three times to cancel Babylon 5, the Deep Space Nine contender.
An 1/6 scale collector's Jean-Luc Picard in his command chair figurine is added to Howard's bedroom set. It is a to 6oo pieces limited collectible from Hollywood Collectibles, soon to be released later that year, in September 2013, and therefore a clearcut case of product placement in this instance. [13] [14]

"The Stag Convergence" (Ep. 22)

Sheldon tells Wil Wheaton (who said he was attending Howard's bachelor party because it was a welcome alternative to George Takei's hot tub parties) to "talk to the hand" and gives him the Vulcan salute.

"The Launch Acceleration" (Ep. 23)

Amy in a classic uniform

Howard tells Raj "You watch Star Trek, I live it" when discussing Howard's aborted mission to the International Space Station. Leonard and Sheldon again play three-dimensional chess. Later, Leonard comes home to find Sheldon and Amy playing "Star Trek doctor" with Sheldon uncomfortably, yet unwilling to stop, lying on the couch while Amy, dressed in a sciences division blue Original Series women's uniform, pretend-scans him with a toy medical tricorder.

"The Countdown Reflection" (Ep. 24)

Despite his initial offer to do so being soundly rejected, Sheldon performs part of Howard and Bernadette's wedding in Klingonese and says "and the Klingon High Council" when pronouncing them man and wife.

When the rocket is launched, Sheldon quotes the title sequence from The Original Series saying "Boldly go, Howard Wolowitz".

Season 6 (2012-2013)

"The Habitation Configuration" (Ep. 07)

Sheldon presenting Amy with the DVD box set

Sheldon tries to do a segment on Trek flags on his "Fun With Flags" web show, first with Wil Wheaton (who keeps trying to do a bit on the Federation flag, much to Amy's dislike) and later with LeVar Burton, telling his viewers to "set phasers to fun." To get Amy to see things his way in the matter, Sheldon gives her the TNG Complete Series DVD Boxset and "briefly" describes "Encounter at Farpoint" scene-by-scene to her through her closed apartment door. Wil's house number is 1701, the Enterprise's hull number.

"The Fish Guts Displacement" (Ep. 10)

Amy suggests that Sheldon punish her by not letting her see the new Star trek movie, which Sheldon however finds a too harsh punishment not befitting the "crime" – to the dismay of Amy.

"The Egg Salad Equivalency" (Ep. 12)

When the two are discussing their day over dinner, Leonard mentions to Penny that he found an online quiz called "Which Star Trek character are you?", proudly stating that it only took him four tries to get Captain Kirk. When he starts to use Kirk's intonation, Penny cuts him short.

Later, when Leonard reassures an insecure and jealeous Penny that she has nothing to fear from Alex – the pretty research assistant of Sheldon who had made a move on Leonard earlier on – he does admit feeling like Captain Kirk, being chased by so many pretty women. Penny warns him that if he does not quit invoking Kirk right away, all womenhood will immediately stop doing so forthwith. "Message received", Leonard answers, not able to suppress the urge to use Kirk's intonation yet again.

A Google search will actually yield several results with the exact quiz title.

"The Bakersfield Expedition" (Ep. 13)

Raj, Sheldon, Leonard, and Howard cosplay as Worf, Data, Picard, and a Borg

While driving to the Bakersfield, California Comic-Con, the guys stop at Vasquez Rocks Natural Area Park to pose for photos in their The Next Generation costumes: Leonard as Picard, Sheldon as Data, Raj as Worf, and Howard as a Borg. After their car gets stolen, Sheldon states that they're all a landing party, obligated as such to overcome hardships. Failing to get a lift and being thrown refuge at by a passing car, its driver shouting "nerds" at them, the boys eventually stumble into a roadside restaurant in their disheveled Star Trek outfits, being met with wary bemusement by the other patrons, chuckling at the "Trekkies" – particularly after the "Borg" Howard asks if his mother should pick them up. The ordeal causes the despondent boys to question their love for Star Trek. After it is decided to rent a car instead to return home, Raj, more steadfastly holding on to his love, asks if the car can be from the rental agency Enterprise.

At the same time the boys have their ordeal, Chris Hemsworth's Marvel Comics character Thor becomes a point of argument for Penny, Amy, and Bernadette, when they made an effort to understand their boyfriends' nerdiness. When the boys return home, weary of being Trekkies because of their ordeal, they incredulously overhear their girlfriends' heated nerd discussion, causing their own inner nerds to be revitalized. On the assumption they have stumbled into an alternate reality and with their disheveled costumes put in order, the revived landing party prepares to break into the room to investigate with "phasers on stun", since Leonard in particular does not want to "vaporize" Penny, as he will never be able again to get another girlfriend that gorgeous.

Bif Bang Pow! Star Trek TNG The Big Bang Theory action figure set.jpg
Leonard, Sheldon, and Raj are all wearing Season 3 uniforms, whereas Howard is wearing a
Next Generation TV series version of the Borg outfit. Based on this particular episode and on the occasion of The Next Generation's 30th anniversary, toy company Bif Bang Pow! released a July 2017 San Diego ComicCon "convention exclusive" boxed set of 4" action figures of the gang in their episode cosplay outfits, against a diorama of Vasquez Rocks. [15] Limited to 2,288 pieces, it was the company's fourth Star Trek-themed show release after the two previous ones.
The actual Enterprise Rent-A-Car agency is named after the World War II aircraft carrier USS Enterprise (CV-6) on which its founder had served, [16] and after which Gene Roddenberry had named his fictional starship.
Aside from being the most heavy Star Trek referencing one of the entire series, this episode also constitutes its most outspoken commentary, on how non-fan society at large generally views the "Trekdom" phenomenon, and it is in effect Penny in particular who serves throughout the entire series as a proxy for the non-fan society with her wary, oftentimes bitchy – especially in the earlier "The Nerdvana Annihilation" episode – bemusement at the boys' passion for Star Trek.

"The Contractual Obligation Implementation" (Ep. 18)

While discussing the advancement of women in science, Sheldon names Star Trek writer D.C. Fontana as a woman who had to use her initials to hide her gender in her field of work. He also states he is preferential to a gender-blind society like in Star Trek, which is put in perspective by Leonard who observes that while warp drive was invented in that society, a black woman still had to answer the phone. Leonard's observation entices Howard to chime in with him reminiscing about how "many times he spent alone with Lt. Uhura in the shower."

This was the same D.C. Fontana who had previously made her background cameo appearance in "The Russian Rocket Reaction".
Both Leonard's observation as well as Howard's inappropriate and sexist remark (having already made one about Uhura in "The Precious Fragmentation") are subtle reminders of the sexism allegations both Costumer William Ware Theiss and Creator Gene Roddenberry faced in the Original Series-era for the depiction of women in the latter's creation.

"The Love Spell Potential" (Ep. 23)

Sheldon says he's tired of Leonard always invoking Zachary Quinto whenever Sheldon doesn't like an impending change.

"The Bon Voyage Reaction" (ep. 24)

Sheldon explains his personal trick to overcoming his social anxiety was to picture everyone as a Star Trek character. Apparently Raj is "Uhura" while Leonard is "Unnamed Crew Member In A Red Shirt".

Sheldon is apparently aware of Raj owning an Uhura dress, as mentioned by Raj's sister Priya in "The Prestidigitation Approximation".

Season 7 (2013-2014)

"The Hofstadter Insufficiency" (Ep. 01)

During Leonard's absence, Penny and Sheldon play a game of 3D chess. Sheldon also starts to ask Penny about Starfleet captains, before being cut off by her.

"The Discovery Dissipation" (Ep. 10)

To help Sheldon feel better about Leonard disproving his discovery of a new element, Wil Wheaton comes by and tells Sheldon that for a while he regretted being Wesley Crusher.

"The Cooper Extraction" (Ep. 11)

Sheldon is absent during the Christmas season, and while the gang is decorating the Christmas tree, Raj asks if the tree can now sport both Star Wars and Star Trek ornaments on the same branch, to which Leonard answers, "I know, it’s crazy. Welcome to the Thunderdome, people."

Raj is referring to the Christmas ornaments as released by Hallmark, whereas Leonard's answer references the famous line uttered by singer Tina Turner in the third Mad Max film, Mad Max Beyond Thunderdome.

Season 8 (2014-2015)

"The Expedition Approximation" (Ep. 06)

During a deep cave simulation in an abandoned mine, Raj makes a remark about Voyager, Sheldon inquires which Voyager Raj means, the actual deep space probe or Star Trek: Voyager, the television show. After Raj confirms he is talking about the actual space probe, Sheldon retorts, "Good. Because I am too hot and tired to go on about how much I hate Voyager the TV show." Meanwhile, Howard and Bernadette have a heated argument on what each spouse brings into the marriage, with the high-earning Bernadette scoffingly accusing Howard to have only brought in his Star Trek collectible plate collection, and an incomplete one at that. Howard indignantly retorts he just completed the collection with the purchase of the last missing Scotty one on eBay, but tries to dodge Bernadette's inquiry for how much, after which the argument flares up again in full force.

One of the very few times that any of the other Star Trek television series besides TOS and TNG, is actually mentioned by name, with Sheldon reflecting the stance taken by a part of the contemporary Star Trek fanbase at the time.
Howard's Star Trek collectible plate collection could have come from a small number of companies, with those from The Hamilton Collection being good candidates and which had the "Scotty" plate as part of its first, 1983 "Star Trek Crew Collection" plate collection.

"The Misinterpretation Agitation" (Ep. 07)

Sheldon offers a beverage to a Dr. Oliver Lorvis after he admits his intention to give some flowers to Penny. Later when receiving his drink, Lorvis, turning out to be a rabid science fiction memorabilia collector himself, compliments Sheldon's Star Trek mug and mentions that he got an original phaser, after having given Gene Roddenberry a vasectomy. Lorvis also divulges that he had helped William Shatner with kidney problems, having received from him an original tribble for his troubles, though he was not sure if it in effect had not been Shatner's toupee all along.

Shatner had in real life indeed a kidney stone removed – presumably not by Dr. Lorvis – which he managed to sell in 2006 for US$25,000 at Julien's Auctions, the proceeds of which donated to a charity. [17] Also, Shatner went prematurely bald and had already been wearing a toupee in the Original Series era. Ever since, the vanity choice has, outside this one episode, been the butt of a joke on more than one occasion elsewhere.

"The Champagne Reflection" (Ep. 10)

Sheldon introduces LeVar Burton for the final "Fun With Flags" webisode by saying he "puts the Geordi in your La Forge." Later LeVar says he should've taken Wil Wheaton's advice about getting a gate for his house when Sheldon tells him the web show's been resurrected.

"The Clean Room Infiltration" (Ep. 11)

At Amy's Christmas party, Dr. Koothrappali (Raj's father, who has recently divorced and is visiting from India) states that it is too soon to be dating again. Penny says she would if she was free, but pauses to inquire if he is not also talking about Star Trek all the time.

"The Colonization Application" (Ep. 17)

After he has wronged Amy, Sheldon tries to make amends by suggesting to play The Original Series theme through his nose. When he starts to do so, a still irked Amy cuts him short.

This is the episode that featured the Leonard Nimoy end title card homage.
It was shortly after this episode that an addition to the living room bookcase became discernible in the tail-end of the season; the talking Spock bubble head figurine from toy company Funko, in 2009 released as an outing in their "Wacky Wobbler Bubble-Head" line. It eventually usurped the place next to the Master Replicas/eFX tricorder replica, hitherto held by the MythBuster Adam Savage bubble head figurine. The figurine went on to become part of the standing set dressing and can be spotted in the remainder of the show.
Funko's Bubble-Head line was expanded in 2013 with the four boys clad in their Original Series outfits. [18]

Season 9 (2015-2016)

"The Spock Resonance" (Ep. 07)

Wil Wheaton and Adam Nimoy come over to interview Sheldon for Adam's documentary about Leonard Nimoy, or as Sheldon put it, a "Spockumentary", quickly attributing the too obvious witticism to his roommate Leonard when it does not solicit any laughs. Sheldon tells the pair that the episode that really had meaning in his life was "The Galileo Seven". He also mentions that as a child he tried to perform a Vulcan neck pinch on a bullying schoolmate, which however only netted him a broken collarbone. He also divulges that he has left Wheaton the Wesley Crusher action figure in his will, the one he was gifted by him earlier in "The Russian Rocket Reaction". During their visit, Sheldon presents the napkin complete with Nimoy's DNA that he received from Penny as gift in "The Bath Item Gift Hypothesis". While interviewed, Sheldon's recent breakup with Amy becomes topic of the conversation, which he at first claims does not emotionally affect him, as he, like Spock, is above human emotions. When Penny – of all people – however points out to Sheldon that Spock was half-Human, and thus in part an emotional creature, Sheldon, clearly struggling with his feelings for Amy and unable to dispute Penny's "logic", breaks down and storms out of the room.

Later that evening, Sheldon reemerges from his room and informs Leonard and Penny that he is going to propose to Amy (which he until then unbeknownst to the others had already intended before the breakup) and get it over with either way, citing the Vulcan proverb "Kup-fun-tor ha'kiv na'ish du stau?" ("Can you return life to what you kill?"). Penny asks Leonard, if he understands what Sheldon is saying which he firmly denies, though timidly restating "no" in Vulcan ("nirsh") when she gives him the stink-eye. Before leaving, Sheldon exclaims that Amy can just "ponfo mirann" ("go to hell") if she should refuse him. "He doesn't mean that," Leonard quickly says to Penny when she again looks at him quizzically, completely destroying his credibility. Sheldon leaves for Amy's apartment, but finds her kissing another man in front of her building. After returning, a despondent Sheldon re-watches "Where No Man Has Gone Before", scoffing at Spock for his claims of being unemotional at the beginning of the episode.

This was an instance of art imitating life, as Nimoy was at the time actually preparing a documentary on his father, which was released one year after the episode in 2016 as For the Love of Spock. Reciprocally, a scene from the episode wherein Sheldon was informed that he was to be interviewed by Adam Nimoy, was included as one of the opening scenes of Nimoy's documentary.
The un-Vulcan like "ponfo mirann" has actually been uttered in canon by Hoshi Sato in the Enterprise pilot episode "Broken Bow", its meaning confirmed by writer Mike Sussman. The Vulcan saying on the other hand, was part of a larger proverb, purportedly attributed to Surak, and most likely originating from the by Mark R. Garden written unlicensed and non-canon 2011 (fan) reference work The Vulcan Language (p. 299, ASIN B0025UUVJS), first published online in 2004. [19]
The Wolowitz couple start redecorating their home in this episode, after which an alternate reality USS Enterprise model from toy company Kre-O was added in the living room bookcase, seen throughout the remainder of the series.

"The Mystery Date Observation" (Ep. 08)

In an effort to get over Amy, Sheldon solicits the help of Howard and Raj to help him find a new mate, as they had already managed to do so with Amy through a dating site. They decide on a slightly different approach this time in singling out women, who meet all of Sheldon's many, many specifications by devising an online contest in which women can win the opportunity to meet Sheldon in person after having solved a series of puzzles, devised by Sheldon. One of the puzzles is to translate a Klingon text in ancient Sanskrit. As they had already been earlier with Amy, Howard, and Raj are flabbergasted when a handsome female scientist actually shows up at Sheldon's door quoting the text in impeccable Klingon and in its Sanskrit translation. Furthermore, she seems to tick of all of Sheldon's other boxes, while chatting with him. However, much to the consternation of his friends, Sheldon turns her away as she showed up one minute after the set deadline of the test had expired, as well as having solved the test while being bored by a symposium on atomic spectroscopy, the latter being a deal breaker for Sheldon.

This episode (as did the preceding one for that matter), actually also refers to the production origins of the spoken Klingon and Vulcan languages as heard from Star Trek: The Motion Picture onward. The phonetics for both languages were originally developed for the film by Hartmut Scharfe, an UCLA linguistics professor specialized in ancient languages of the Middle East, Sanskrit in particular – hence its reference in this episode. His oral Klingonese however, was restructured by James Doohan and Jon Povill during the production of the film, and developed further still by Marc Okrand for the subsequent Star Trek incarnations. On the other hand, Sharfe's oral Vulcan language remained largely unchanged, but has never been officially beefed out the way Klingonese had later on, when discounting the work of dedicated fans such as the above-mentioned Mark Gardner and Dorothy Jones Heydt.
Despite Penny, Amy, and Bernadette giving the impression to the contrary on the show, the hapless winner of Sheldon's contest is one of the show's rare acknowledgements that the Star Trek fan base also consists of a substantial female contingent.

"The Platonic Permutation" (Ep. 09)

Leonard has a pair of Mr. Spock oven mitts, which he shows to Penny.

The vanity card for this episode also references the upcoming Star Trek series (Star Trek: Discovery) on CBS All Access, though not a single mention of the new series was made in the episode itself, or indeed in the rest of the season for that matter.
Technology industrialist and spaceflight pioneer Elon Musk makes his first franchise guest appearance in this episode as a soup kitchen volunteer, and who Howard tries to impress – rather unsuccessfully however. Like Neil deGrasse Tyson before him, Musk became relatively late formally tied to the Star Trek franchise when he was referenced to by name in the Discovery season one episode "The Butcher's Knife Cares Not for the Lamb's Cry".

"The Opening Night Excitation" (Ep. 11)

Sheldon has a poster for TOS: "Spock's Brain" in his room. Wil Wheaton goes back to evil mode by showing up at the movie theater showing of Star Wars: The Force Awakens dressed as Spock.

The Force Awakens was co-produced by Bad Robot Productions, and directed by J.J. Abrams, and had the Star Trek Beyond trailer showing before it. The visual effects of this, and all other Star Wars movies, were produced by Industrial Light & Magic, who has also done so for the majority of the Star Trek films.
Wheaton purposely showing up in his Star Trek outfit and subsequently being booed and hissed at by the Star Wars audience, is a reference to the very fierce competition that had existed between the fanbases of the two respective franchises, and which is to an extent still upheld to this day by the more fanatical fans of either. The show has featured almost as many Star Wars references as it had those from Star Trek, and this episode actually started off with the signature Star Wars intro crawl.
The US$2 billion plus grossing The Force Awakens and the subsequent US$1 billion plus grossing Rogue One: A Star Wars Story spin-off film, have in part contributed to the commercial failure of Star Trek Beyond. (see: Star Trek films: Gross vs net profitability)

"The Meemaw Materialization" (Ep. 14)

While discussing his recent reconciliation with Amy, Leonard "points" out to Sheldon that he owns two pairs of Spock ears, one for ComicCon and one for around the house.

Sheldon has not been seen wearing his "around the house" pair; the ones he wore in the season 2 episode "The Codpiece Topology" is presumably his ComicCon pair.

"The Celebration Experimentation" (Ep.17)

Wil Wheaton gives a speech during Sheldon's birthday party, stating that while Sheldon may be a Star Trek fan, he has become a Sheldon fan and concludes with the traditional Vulcan "Live long and prosper" valediction. Sheldon turns to Howard, who had just given a more traditional birthday speech, saying, "That's how you do it, Wolowitz. Now you see why he's famous and you're not". A short time later Stephen Hawking also chimes in via Skype, awkwardly singing "Happy Birthday".

Season 10 (2016-2017)

"The Military Miniaturization" (Ep. 02)

During an attempt to sell a by them invented guidance system to the military, under the proviso not to use it for lethal purposes, Colonel Williams states, "Look guys, its just a guidance system. It's not like you're handing me the Death Star from Star Trek." Forced by his his friends to remain silent as not to endanger their pitch, Sheldon nearly suffers from a stroke, because of the inaccuracy. When Williams subsequently assumes Howard to be the brains behind the invention, praising his engineering skills and his education at MIT, Sheldon can no longer contain himself and blurts out, "I'm Dr. Sheldon Cooper. I'm the actual brains behind this project. Also, engineers aren't real scientists, MIT is a trade school, and the Death Star is from Star Wars not Star Trek. Otherwise, thank you for your service."

Aside from being yet another one of the ubiquitous references to the Star Wars and Star Trek dichotomy, the Colonel Williams character can also be construed as a well hidden proxy for CBS' then most senior executive, Les Moonves, who is persistently rumored not to know the difference between the two either. [20] Not being able to distinguish between the two franchises had already been an explicit topic in conversation between the girls in the prior season 5 episode "The Weekend Vortex".

"The Cohabitation Experimentation" (Ep. 04)

When Sheldon exhibits trepidation to switch apartments in order for both boys being able to live together with their respective paramours, Leonard entices Sheldon to do so, by comparing the five week experiment to The Original Series, stating, "The Enterprise was on a five-year mission to explore new worlds. Think of this as your own personal five-week mission to do the same," to which Shelon replies, "If you want to lure me in with sexy talk, that's how you do it." Very pleased with his own Star Trek wit, a smug Leonard is quickly put back in his place when Penny says that it is nothing to be proud of.

"The Veracity Elasticity" (Ep. 07)

Leonard discovers that Penny has been surreptitiously moving his collectibles into storage for quite some time now, one collectible at the time. One of the now missing items concerns his Klingon phrase-of-the day calendar. Not wanting to let Penny and Amy (who has also been lying to Sheldon that her apartment has long since been repaired as she does not want to end the "cohabitation experimentation" they embarked upon in episode 04) know that they are on to them, Leonard and Sheldon start to discuss the matter in Klingonese, much to the frustration of the girls, who subsequently start discussing themselves in Amy's own made-up language. When the Wolowitz couple arrives, Howard sides with the other boys and starts conversing in Klingon as well, before the girls, in unison, make them shut up.

"The Geology Elevation" (Ep. 09)

Sheldon is jealous of his CalTech geology colleague Bert, who has won an important science award. In a fit of frustration Sheldon tries to give him what he called a "Captain Kirk karate chop", but only succeeds in hurting his own hand. Back in the apartment Amy is bandaging his hand, when Stephen Hawking chimes in via Skype trying to console Sheldon. He reminds him that he has never won a Nobel Prize, but that he, like Sheldon, has many other life accomplishments and mentions his guest appearances on The Simpsons and Star Trek: The Next Generation. When an excited Leonard starts to explain his "Descent" scene to Penny, it takes her but one foul look to make him shut up.

"The Property Division Collision" (Ep. 10)

Sheldon takes possession of the 3D chess game

Now that the new living arrangements have become permanent, the time has come to divide the collectibles Sheldon and Leonard have accrued together in their time as roommates. Items to be divided include a Spock cuckoo clock and the 3D chess game which Sheldon can not possibly conceive Leonard wanting to have, as he has beaten him each and every time "in length, width and in depth". When Sheldon selfishly starts to lay claim on each and every single collectible, the boys start bickering. Not yet realizing that they are suffering from a severe case of separation anxiety after their thirteen years together, the conflicts quickly spirals out of control.

The Spock cuckoo clock is a modified standard clock with the cuckoo replaced with a Spock head – obviously liberated from an action figure – chiming "Live Long and Prosper" instead of "cuckoo". There actually exists a to 5,000 pieces limited officially licensed – and more professionally executed – Original Series cuckoo clock from The Bradford Exchange, issued in 2015. [21] While further clearing out their wall closet of their collectibles, other identifiable Star Trek items – these ones at least officially licensed merchandise – can be discerned, including a closed 1970s Mego U.S.S. Enterprise Action Playset/Gift Set (either no. 51210 or 51217, or the 2008 retro reissue by Diamond Select Toys in their "Cloth Retro Series 1"), the 2000 Star Trek Limited Edition Monopoly board game, as well as the 2011 Star Trek: Expeditions board game from WizKids. The Funko talking Spock bubble head figurine from "The Colonization Application" is after this episode seen in the living room cupboard of Sheldon's and Amy's apartment with an additional Spock bust seen on the nightstand in the couple's bedroom. The Adam Savage reoccupies the place it had previously surrendered to the Spock bubble head figurine.
Having made several prior, and one subsequent, show appearances, starting with the season one episode "The Pancake Batter Anomaly", the 3D chess set makes its penultimate appearance on the show in this episode, albeit only in its packaging. That packaging incidentally, provides proof positive that the show-used set had not been a Franklin Mint product, as the packaging is clearly not from that company, but rather from an other obscure, possibly unlicensed, Star Trek collectible company, as no company name is mentioned on the otherwise clearly discernible box sticker.
Making his single guest appearance in this episode is Star Trek III: The Search for Spock Kruge performer Christopher Lloyd as the homeless, yet surprisingly empathetic hobo Theodore, whom Sheldon has surreptitiously sublet his old room to in order to spite Leonard during the escalation of their conflict. Lloyd is even more renowned as Doc Brown in the Back to the Future franchise (whose iconic DeLorean time machine was designed by Star Trek alumnus Andrew Probert), which incidentally, is one the boys are also fan of in the show.

"The Holiday Summation" (Ep. 12)

During the holidays, Leonard has found another use for his pair of Spock ears besides ComicCon, wearing them as part of his Christmas elf outfit, when he and Penny go out to get a Christmas tree.

"The Allowance Evaporation" (Ep. 16)

While on a dinner dated with Amy, the subject of Sheldon's restraining orders comes up. Apart from the ones he already has from Carl Sagan, Leonard Nimoy, Stan Lee, and Bill Nye, it is revealed that Zachary Quinto too has taken one out against Sheldon, after he had tried to engage Quinto in conversation through the closed door of a toilet booth in a public restroom.

Undoubtedly Sheldon had wanted to either discuss his disappointment with Quinto as Spock, his approval of him as Heroes' Sylar, or both.
Unlike fellow science communicators Carl Sagan and Neil deGrasse Tyson, popular science communicator Bill "The Science Guy" Nye (conceivably the inspiration for the Professor Proton character) does not have formal Star Trek ties. Nonetheless, it was Nye who presented the Star Trek television franchise as a whole with its honorary "Governors Award", on 8 September 2018 at the Creative Arts Emmy Awards ceremony – exactly fifty-two years after the very first Star Trek episode was aired on US television. [22] Nye has made an appearance though as an interviewee in one of the special features of the 2016 Star Trek: The Original Series - The Roddenberry Vault Blu-ray release.

"The Escape Hatch Identification" (Ep. 18)

Sheldon, who is notoriously afraid of dogs, calls Cinnamon, Raj's Yorkshire terrier (a tiny, hairy race), an "attack tribble".

"The Long Distance Dissonance" (Ep. 24)

Sheldon is showing Dr. Ramona Nowitzki, a former admirer of Sheldon, his collection of letters he has received from celebrities. One of them is from Patrick Stewart in which he says that if Sheldon ever comes calling again at his house, he gets to "meet his dogs".

Season 11 (2017-2018)

"The Proposal Proposal" (Ep. 01)

After he has successfully proposed to Amy, Penny is musing if Sheldon is going to want "some weird Star Trek wedding", having already managed to successfully shut down hard Leonard's suggestion of having a "Doctor Who wedding cake".

Stephen Hawking makes his seventh guest appearance in this episode, but it was also his last before his death on 14 March 2018.

"The Retraction Reaction" (Ep. 02)

Sheldon opens up his stash of Romulan ale (blue-dyed vodka) for a depressed Leonard. Penny later joins them and claims that while she doesn't know who the Romulans are, they sure know how to party.

"The Relaxation Integration" (Ep. 03)

Sheldon tells Amy that he will appear at their wedding with a tuxedo over a Star Trek uniform. An imaginary "Council of Sheldons" is later held in the head of Sheldon in which the assembly of his various incarnations, including a "Fanboy Sheldon" dressed up as Spock, decides on the admittance of "Laid-Back Sheldon", which is denied. Fanboy Sheldon also requests the removal of "Humorous Sheldon" from the council.

"The Explosion Implosion" (Ep. 04)

Leonard owns a Captain Kirk shirt, which needs to be dry cleaned.

"The Proton Regeneration" (Ep. 06)

Sheldon, who plans to audition for a role in a remake of "Professor Proton", visits Wil Wheaton in search for an acting coach, and asks him if he has the address of Patrick Stewart. Like Stewart has done before him, Wheaton threatens to set his dog on Sheldon, if he does not leave his premises immediately. Unbeknownst to Sheldon however, Wheaton is also vying for the role, and is put back on Sheldon's list of enemies after he becomes the one who gets the part.

"The Bitcoin Entanglement" (Ep. 09)

Having stewed on his retribution for years after the three other guys had mined bitcoins without him long before they gained their spectacular rise in value, Sheldon states, "I plotted my revenge. If you get a dish, I'll serve you some cold," when he comes clean that he had hid the files on Leonard's own flashdrive in retaliation, after the three desperate guys can not relocate the bitcoin files. Leonard then embarrasses Sheldon by disclosing that he had lost the flashdrive several years earlier.

This is at least the third time that Sheldon invokes Khan's Klingon proverb from The Wrath of Khan.

"The Confidence Erosion" (Ep. 10)

When Sheldon and Amy start bickering over the details of their upcoming wedding ceremony, Sheldon insists on having their wedding vows uttered in Klingon if Amy does not dial back her own Little House on the Prairie-themed demands for the ceremony.

Little House on the Prairie from Star/Producer Michael Landon is Amy's passion, and was the television show legendary Original Series Art Director Matt Jefferies was working on in 1977 when he received the invitation from Gene Roddenberry to return to Star Trek for Star Trek: Phase II. Jefferies, who immensely enjoyed both the show and his personal relationship with Landon, only agreed to do so on a temporary basis, as the show was in hiatus at the time. He subsequently returned to Little House when production resumed. Still, the refit-USS Enterprise and its redesigned bridge are largely based on his design inputs during his short-lived tenure on Phase II.

"The Sibling Realignment" (Ep. 23)

After having traveled to Texas, Sheldon and Leonard try to convince Sheldon's older brother George Jr. to attend his upcoming wedding, which the latter had refused at first. Later, George confides in private to Leonard that he had been hard on Sheldon in their childhood in order to protect him from his own foibles and to prepare him for real life. When Leonard asks if sitting on his younger brother's head while he was watching Star Trek had been part his tough love, George denies this by asserting that that had been "hilarious".

Later Star Trek: Lower Decks voice-performer Jerry O'Connell makes his first of in total three appearances on the show as Sheldon's older brother George Jr, the second already in the next episode

"The Bow Tie Asymmetry" (Ep. 24)

Wil Wheaton is slated to officiate the wedding of Sheldon and Amy, but his place is unceremoniously usurped by the by Howard arranged surprise guest Mark Hamil, the Luke Skywalker actor from Star Wars. Miffed, Wheaton acidly states, "So we finally meet", and when Hamil does not recognize Wheaton, the latter starts bickering with Hamil throughout the entire ceremony.

Wheaton and Hamil feuding is a clear-cut allusion to the intense rivalry that had existed between the fan bases of Star Wars and Star Trek in the early decades. Like with those of Star Trek, Hamil has not been the only Star Wars alumnus to make an appearance on the show, Carrie Fisher (Princess Leia) and James Earl Jones (the voice of Darth Vader) also had guest appearances.
In a scene cut for time from the episode, Amy and Sheldon are sent a wedding gift from Stephen Hawking. One day after the episode had aired on 10 May 2018, the deleted scene was put online on the show's Facebook page as a homage to the recently deceased scientist and co-star, with an accompanying in memoriam end title card.

Season 12 (2018-2019)

"The Imitation Perturbation" (Ep. 06)

While discussing the upcoming Halloween season, the 40th anniversary of the epynomous horror movie comes up, with Leonard remembering that the face of the movie's antagonist Michael Meyers had been a modified Captain Kirk mask.

In the 1999 documentary Halloween Unmasked 2000 it was revealed that this had actually been a valid piece of trivia.

"The Grant Allocation Derivation" (Ep. 07)

Sheldon soundly defeats Leonard yet again at a game of 3D chess, the latter's usual ineptitude at the game only aggravated by his preoccupation with an unenviable chore the university has burdened him with.

This is the final time the game was seen on the show.

"The Confirmation Polarization" (Ep. 13)

The guys are discussing Star Trek: Discovery, Walking Dead, and Black Mirror during their lunch break in the university's cafeteria, but cut their discussion short because someone is behind in watching each and want to avoid hearing any spoilers.

The first of only two occasions the latest, and CBS created, reincarnation of Star Trek is mentioned on the show and very fleetingly at that, despite its second season already being aired alongside The Big Bang Theory's last. Incidentally, the heavily Original Series-inspired Black Mirror fourth-season episode "USS Callister" had cleaned up at the 2018 Emmy Award ceremonies, defeating the nominated first season episodes of Discovery. (see: main entry)

"The D & D Vortex" (Ep. 16)

Will Wheaton brings William Shatner on his Professor Proton show to meet Sheldon, who unfortunately gets so excited to meet "Captain Kirk" as "Science Officer Cooper" that he vomits all over him. Later, the boys find out that Wheaton has Stuart, alongside Shatner and other celebrities, included as part of a Dungeons & Dragons role playing game group. Leonard, but not the other guys and certainly not Sheldon, gets invited to join the group after Stuart drops out. Though sworn to secrecy, Leonard cannot refrain himself from telling Penny – and thus the other two girls – who then accost Wheaton as one of the other celebrities is an actor the girls have the hots for. Leonard is subsequently thrown out by a miffed Wheaton, though he surreptitiously allows the girls to participate, as a form of punishment. During the game Shatner annoys his fellow gamers by making a constant flow of Star Trek references such as "I was about to go all Wrath of Khan on the ogres", and every time he does so, he has to put money in a Star Trek "swear jar", which he finds totally "worth it".

After Nimoy and Takei, Shatner – having already been referenced to on numerous occasions in previous episodes as both himself and his Kirk alter ego – was the third Original Series actor to make an appearance on the show, as well as becoming the last Star Trek alumnus to do so for the first time. For Wheaton, it was already his seventeenth appearance on the show, but also his last.
Shatner appearing in a comedy production is far from being out-of-character as he has a well known character trait of being able – whether or not in the guise of his Captain Kirk alter ego – to poke fun at himself, exhibited on more than one occasion, especially in the 1999 film Free Enterprise from Mark A. Altman and Robert Meyer Burnett, which thematically can in hindsight be seen as an early precursor to The Big Bang Theory. Shatner had already been regularly asked by fans when he would make an appearance on the show, but like he had for Free Enterprise, he held out until the right script came along that catered to his sense of humor. Shatner's constant flow of Star Trek references actually reflects on the show itself.
Penny actress Kaley Cuoco shares screen time again with Shatner after their prior commercials, and their to-and-fro bantering in the episode references the commercials. In a tongue-in-cheek behind-the-scenes video of those commercials Cuoco asks Shatner for autographs for her four male Big Bang Theory co-stars, but declines one for herself, mirroring the attitude of her Penny alter ego on the show. [23]

"The Decision Reverberation" (Ep. 20)

Spurred on by Penny to exert some much needed assertiveness, Leonard "confidently" tells Penny they are going to watch Discovery after they have had sex. Penny concedes but notifies Leonard she will be mostly watching her smartphone after sex.

The second and last time Discovery is mentioned on the show. When discounting the background set dressings, it is also the final direct Star Trek reference on the show.
It appears a bit incongruous that CBS had not made more of the opportunity to promote the newest Star Trek series on the show, but the with much pomp and circumstance launched (the launch not even referenced at all in the prior season of the show) Discovery had not become the triumph CBS had hoped for; reception was mixed at best as the show caused a rough, rather sharp fifty-fifty divide in the fanbase with fans pitted against each other at the opposite sides of the like/dislike spectrum, with all the discourse on social media it entailed. Quite conceivably, the Big Bang producers opted to shy away from being pulled into a war of words which was not theirs, and that the two very fleeting and non-committal references were only inserted to appease the CBS overlords. The producers were forewarned by the 2017 Star Wars film The Last Jedi, referenced favorably in season 11, which had sparked a far worse and even more vitriolic controversy among its fanbase on social media, and which had dire consequences for that franchise.

Young Sheldon (2017-)

The Big Bang Theory universe was expanded significantly when in 2017, the prequel spinoff Young Sheldon was launched, focusing on the childhood of Sheldon Cooper in his home state of Texas, elaborating on the many childhood events Sheldon has mentioned over the course of the main series. Performer Jim Parsons reprised his role for the series as the adult Sheldon, retrospectively commenting on his childhood experiences in a voice-over part. The (recurrent) cast included Wallace Shawn as Dr. John Sturgis, the boyfriend of Cooper's maternal grandmother, affectionately coined "Meemaw" by Sheldon; Jason Alexander recurs as Gene Lundy, the high school drama teacher; while Harry Groener guest-starred in the first season episode "An Eagle Feather, A String Bean & An Eskimo" in 2018. Ed Begley, Jr. followed suit from the second season onward, recurring as Dr. Linkletter, colleague and rival of John Sturgis. The spin-off series starts off being set in 1989, two years after the launch of Star Trek: The Next Generation.

One of young Sheldon's favorite television programs he regularly watches on the show is Carl Sagan's acclaimed 1980 popular science series Cosmos: A Personal Voyage (as established in the main series Sagan will take out a restraining order against Sheldon later in life). That series was served by visual effects company Magicam, Inc., the company that had previously provided the studio models for Star Trek: The Motion Picture prior to the Cosmos assignment. Their work on Sagan's show had earned the company three Emmy Awards. An updated and modernized remake – or sequel – Cosmos: A Spacetime Odyssey, was aired in 2014, followed by Cosmos: Possible Worlds in 2020. Both produced by former Star Trek showrunner Brannon Braga, they were hosted by Neil deGrasse Tyson, who was inspired to embark on his scientific career because of Sagan and his show.

Whether or not (consciously) intended as such, young Sheldon's family background is actually remarkably similar to that of Star Trek creator Gene Roddenberry; like young Roddenberry, Sheldon is an atheist growing up in conservative Texas, has one brother and one sister, a devout Baptist mother who forces her offspring to attend religious gatherings, a non-religious father who is a Vietnam War veteran (Roddenberry's father was a World War I veteran), as well as having an aversion to his family situation. And like Roddenberry, Sheldon will go on to make a living for himself in California.

Season 1 (2017-2018)

"A Patch, a Modem, and a Zantac" (Ep. 06)

NASA engineer Dr. Ronald Hodges appears as a guest speaker in Sheldon's science class and does not take his idea about VTVL technology seriously. When cornered by Sheldon, Hodges tries to divert attention of his classmates by changing the subject to the sanitation technology for astronauts by asking the class, "Who wants to know where Captain Kirk has gone where no one has gone before?" Later Sheldon proves to Hodges that his theories are sound, but a chastised Hodges admits that technology has not advanced enough to implement his theories, after which a validated Sheldon lets the matter rest.

Decades later, it turned out that Elon Musk has surreptitiously used Sheldon's scientific notes, he somehow had acquired, to successfully have a booster rocket return to Earth on its own accord.

This was Musk's second appearance in the franchise after his first one in the main series. Musk's spaceflight company SpaceX was the first one that managed to have a booster rocket successfully return from outer space on its own accord on 21 December 2015.
The space toilet related "where no one has gone before" joke had already been used in the main series "The Classified Materials Turbulence" episode.

"Spock, Kirk, and Testicular Hernia" (Ep. 09)

Sheldon and Meemaw finish watching "The Return of the Archons", with Sheldon wholeheartedly identifying with Kirk's "You'd make a splendid computer, Mister Spock" remark, whereas Meemaw expresses her affinity for Kirk's swashbuckling nature.

Later Sheldon uses Kirk's cheating on the Kobayashi Maru scenario to justify his own rule-breaking after Georgie admitted to cheating on his math test.

As with all the other Original Series and TNG clippings seen on the family's TV set, the picture quality of the supposedly VHS recordings and/or syndicated airings is such that they are clearly taken from later home video versions of the series – DVD quality at the very least. This is in contrast to Sagan's Cosmos clippings which do show their age.

"Dolomite, Apple Slices, and a Mystery Woman" (Ep. 15)

Sheldon and his only two school friends discuss the names NASA has given its fleet of space shuttle orbiters at lunch, during which Sheldon opines that he is not too pleased with their first one having been called Enterprise, as he deems it a Star Trek-only exclusive name.

Unfortunately for Sheldon, his fellow "Trekkies" were of decidely different mind, as it were they who pressured NASA through a masssive letter campaign to (re-)name their very first orbiter, originally named Constitution, after the fictional starship.

Season 2 (2018-2019)

"A Rival Prodigy and Sir Isaac Neutron" (Ep. 02)

Sheldon is joined in his class by another child prodigy, Paige, which does not sit well with him and he starts to experience bouts of jealously. His mother Mary on the other hand is overjoyed with the advent of another family with a gifted child and invites Paige and her parents to come over, hoping to exchange notes. Sheldon opposes this however, but Mary wins him over by pointing out to him that he had at first also opposed the new Star Trek series The Next Generation for not having Dr. Spock in it. After correcting his mother that it was Mr. Spock, he sees the "logic" of her argument – and after Mary had played the guilt trip card on her son that she realy could do with a likeminded friend – , and subsequently prepares himself for the visit by re-watching "Plato's Stepchildren" in which Dr. McCoy stated, "The release of emotions, Mr. Spock, is what keeps us healthy - emotionally healthy, that is," after which he decides to adhere to the Vulcan principle of kohlinar, just before his brother George, Jr. decides not to want to watch that "crap" and switches channel. Sheldon's intent comes to naught however, when, to his utter horror, Paige embraces him upon arrival, causing Sheldon to conclude that McCoy was idiotic in his observations. After Paige additionally and soundly beats him at a game of chess, Sheldon hears red alert bells go off in his mind's eye.

Mary has been far from being the only one confusing Dr. Spock with Mr. Spock, as this topic has come up in numerous other shows besides this one. Similarly, Sheldon initial aversion to a new Star Trek show without the classic cast was shared by countless fellow "Trekkies", who vehemently protested the new show prior to, and during the airing of its first season.
George, Jr.'s observation of Star Trek being "crap", is a show's reminder that it was not as universally liked as fans themselves liked to believe, a notion that was actually taken into consideration by Paramount Pictures when it came to their release policies regarding live-action Star Trek. (A Vision of the Future - Star Trek: Voyager, pp. 139-140; see also: Star Trek films: Gross vs net profitability)

"A Crisis of Faith and Octopus Aliens" (Ep.3)

A local tragedy causes Mary to significantly increase her religious activities at first, with a retrospective Sheldon deeming his mother's revved-up religious fervor as akin to "starship Enterprise achieving warp factor 9".

"Carbon Dating and a Stuffed Raccoon" (Ep. 7)

Among his "elite" organization memberships, he is especially proud of, Sheldon also cites his "Starfleet International" membership as the second-most important one.

Established in 1973 as "USS Enterprise", Texas-based "STARFLEET International" is one of the oldest Star Trek fanclubs and as of 2021 still in existence. Sheldon had already mentioned being a honoray Starfleet Academy graduate in a prior episode of the main series.

"A Stunted Childhood and a Can of Fancy Mixed Nuts" (Ep. 10)

Missy taunts Sheldon with her statement that Paige, whom she has invited for a sleepover, speaks three languages in contrast to him speaking only his native one, after which he corrects his twin sister that he is in the process of learning conversational Klingon, continuing the conversation in it, before being cut short by Meemaw.

A model of the USS Enterprise NCC-1701 is suspended from the ceiling of the twins' bedroom.

Star Trek's resident Klingon linguistics expert Marc Okrand published his Conversational Klingon in October 1992, seven years after the first time publication of his The Klingon Dictionary, and two years after the time in which the episode is supposedly set. Sheldon's reference therefore constitutes something of a minor anachronism.
Though only fleetingly seen, the Enterprise model could be identified by the presence of its non-canon grid lines on the dorsal side of the saucer as being the founding Star Trek model kit – either no. S921 or one of its many reissues – from longtime model kit company AMT, the oldest known franchise partner of Star Trek.

Season 3 (2019-2020)

Season 3 featured updated opening titles footage; young Sheldon appears in different attires on an alternating basis, each reflecting one of his interests. One of these attires showed Sheldon dressed as Spock, complete with pointed ears, usually featured when an episode was heavy on Star Trek references, such as episodes 3 and 11.

"A Broom Closet and Satan's Monopoly Board" (Ep. 2)

Sheldon gets into an argument with Dr. Linkletter, while attending his physics class at the university, disputing the validity of a more modern interpretation of string theory. Using Star Trek as an analogy Sheldon argues, "Just because something is older doesn't mean that it's not still good. Original Star Trek is older than Next Generation, but if you think that Mr. Data is better than Mr. Spock, you don't know what you're talking about." Dr. Linkletter concedes that he does not, but Sheldon is blissfully unaware the he is referring to the Data/Spock analogy.

"An Entrepreneurialist and a Swat on the Bottom" (Ep. 3)

After Sheldon has misbehaved, angering his parents and Meemaw, he tries to awkwardly convey his feelings of remorse to his family by showing them a VHS recording of "The Devil in the Dark", using the miner's concession in that episode that they have wrongly mistreated the Horta as a proxy for his apology. His family does not get the reference, causing Sheldon to make his family watch the episode again.

"The Sin of Greed and a Chimichanga from Chi-Chi's" (Ep. 8)

Sheldon is offered full-time enrollment at the university where Sturgis teaches. Sheldon is seen watching a VHS recording of "The Enemy" where he mentions to George, Sr. how Geordi La Forge is lost on a planet and Wesley Crusher is using neutrinos in a probe to locate the missing chief engineering officer. In the meantime, principal Petersen orders his staff to please both Sheldon and his father, the highschool football coach, as much as possible in order to keep them attached to the school as Sheldon's high scores is instrumental in the school's funding, succeeding for the time being. As a result, science teacher Givens even goes as far as offering to show a Star Trek episode in class instead of a more traditional educational video, though he is otherwise habitually and utterly exasperated by Sheldon.

"A Party Invitation, Football Grapes and an Earth Chicken" (Ep. 9)

After Missy is invited to a birthday party of the next-door neighbor boy Billy, but Sheldon is not, Mary, convinced that her son desperately needs some social interaction with peers, cajoles Billy's mother to extend an invitation to Sheldon as well. Much to her surprise and dismay Sheldon sees it differently, and only agrees to go to the party dressed as Spock on a scientific away mission. Exasperated, Mary allows him to, and Sheldon – or rather Spock – is subsequently seen at the party taking scientific readings with his tricorder to the bewilderment of Billy's mother and the other kids, but not the dimwitted Billy, who plays along and subsequently gets promoted to "ensign" by "Spock".

Issue 73 of Sheldon's Star Trek: The Official Fan Club Magazine is received in the mail by the Cooper household along with Missy's birthday party invitation.

Sheldon's prediliction to escape for him undesirable social gatherings by pretending to be Spock on an away mission, had already been featured in the main series episode "The Codpiece Topology", but this episode establishes that he had employed the coping mechanism since his early childhood.
The fanclub magazine issue places this episode in April/May 1990. The previous and next series episodes featuring The Next Generation episode references, showcases that the series creators are remarkedbly consistent in adherance to the correct chronology.

"A Live Chicken, A Fried Chicken & Holy Matrimony" (Ep. 11)

Much to Sheldon's chagrin, Georgie has taped over his VHS recording of "Final Mission" and replacing it with a Baywatch episode. To solve this dilemma, Sheldon uses the primitive internet technology of the day using message boards in the hopes of seeking out another Trekkie who may have an uncompromised copy.

After he has found a fellow Trekkie owning one, they both watch the episode at Meemaw's home, much to her chagrin. When they are done, Meemaw throws the Trekkie out, who scurries away, but who is "beaming out" in Sheldon's mind's eye.

"Pasadena" (Ep. 16)

Sheldon receives word that Stephen Hawking will be hosting a lecture at Caltech and finds himself begging both of his parents to take him to California and early on, they refuse, and in his moment of funk, Sheldon channel surfs only to find reminders of Hawking when seeing shows depicting characters in wheelchairs, chief among them, a scene of Christopher Pike in his wheelchair in "The Menagerie, Part I".

After Dr. Sturgis has pulled some strings on his behalf, Sheldon is relieved when he and George Sr. board a flight so the child prodigy can hear his idol speak, though he discovers his fear of flying. George helps his son to somewhat overcome his fears by pretend playing as Captain Kirk and Mr. Spock, and the plane takes off while the Star Trek theme is playing.

Season 4 (2020-2021)

"Graduation" (Ep. 01)

A retrospective Sheldon deemed his own graduation party the best he ever attended, until the one given for his own son Leonard. While he was allowed by his wife Amy to keep the name Leonard, she did not allow the name Sheldon had originally envisioned for their son, "Leonard Nimoy Cooper".

"A Docent, A Little Lady and a Bouncer Named Dalton" (Ep. 02)

Sheldon reveals that Star Trek: The Official Fan Club Magazine occupied the fifth place in the Top 5 news sources his younger self got his current affairs updates from.

Issue 71 (December 1989/January 1990) became the magazine's second issue to be featured on the show as a flashback – and not as part of the ongoing narrative, thus not breaking the chronology as established in the previous season.

"Training Wheels and an Unleashed Chicken" (Ep. 03)

After Sheldon has broken his right arm, he fears that his ability to perform the Vulcan hand salute is seriously impaired.

"A Philosophy Class and Worms That Can Chase You" (Ep. 07)

Sheldon is watching TOS: "Mirror, Mirror", deeming Spock very capable of pulling off a goatee, when he answers a phone call from Dr. Linkletter who wishes to speak to Mary to inform her that he is appointed the safety net for Sheldon when he starts college. While waiting for Mary, Sheldon informs Dr. Linkletter that he had interrupted him while he was watching Star Trek to which Linkletter answers that he is not up to speed with the current animation shows. After Sheldon corrects him, he does concede that there actually had been a Star Trek: The Animated Series and subsequently explains in detail to an exasperated Linkletter how James Doohan provided most of the voices for the guest characters in that series, including that of Kukulkan.

This is the very first reference to The Animated Series ever made in the Big Bang Theory franchise with a specic episode, the Emmy-award winning "How Sharper Than a Serpent's Tooth", to boot.

"Cowboy Aerobics and 473 Grease-Free Bolts" (Ep. 10)

Sheldon tries to badger Dr. Linkletter into taking him on as his lab assistant by overusing the Klingon phrase "HIja'" ("Yes"). Linkletter responds in kind after Sheldon teaches him the Klingon word for "no", "Qo'".

External links