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(written from a Production point of view)
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This page contains information regarding I AM ERROR, and thus may contain spoilers.

While in unfamiliar territory, the USS Discovery crew is forced to get creative in their next efforts to survive opposing and unprecedented forces and return home.


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Background information

  • This is the ninth episode to feature the "mirror universe", which was first seen in TOS: "Mirror, Mirror". The I AM ERROR two-parter "In a Mirror, Darkly" and "In a Mirror, Darkly, Part II" were the last mirror universe episodes to air prior to this installment. Technically, however, this could be considered the tenth episode set in that universe based on the "In a Mirror, Darkly" two-parter connecting the TOS episode "The Tholian Web" into the mirror universe (revealing the fate of the USS Defiant, which was originally featured in that original series episode). It could also be considered the eleventh mirror universe episode if you include "Into the Forest I Go", which did show the mirror universe at the end very briefly, albeit not by name.
  • This episode is one of four not to have the words "mirror" or "glass" in the title despite being set in the mirror universe. The first three were the DS9 mirror episodes "Crossover" (the first mirror universe episode in DS9), "Resurrection", and "The Emperor's New Cloak" (the latter of which happened to be the last of the DS9 mirror universe stories).



  • The Vulcans or a faction of them are shown to be once more in rebellion against the Terran Empire, a century after the mirror Hoshi Sato used the USS Defiant to become Empress of the Terran Empire in January 2155. In "Mirror, Mirror", Mirror Spock is depicted as serving as XO and science officer of the ISS Enterprise in 2267, under the mirror universe version of Captain Kirk.
  • The ISS Shenzhou and ISS Discovery are shown not to have their doors marked with the emblem of the Terran Empire anywhere aboard, unlike either ISS Enterprise or the ISS Avenger. Although the emblem doesn't appear on the doors of the ships, it is shown emblazoned on the floor of the ISS Discovery bridge.
  • The emblem of the Terran Empire is shown in a different design than previously shown in both "Mirror, Mirror" and the "In A Mirror, Darkly" two-parter.
  • Chronologically, this is the earliest reference to the Klingons of the mirror universe.
  • Tilly being captain in an alternate universe was foreshadowed in "Si Vis Pacem, Para Bellum", when an increasingly confused Stamets addresses her by that rank.
  • Lorca adopting a Scottish accent as the ISS Discovery's engineer references Montgomery Scott. Some have taken this to mean Lorca probably either knew or knew of Scott by the time this episode is set. [2] (At this point in time, Scotty had been in Starfleet for about fifteen years).
  • Burnham impersonating her mirror counterpart (who is presumed dead) is reminiscent of Benjamin Sisko having to impersonate his presumed dead counterpart in DS9: "Through the Looking Glass".


  • At the Continuing Voyage Tour convention in Chicago on 16 September 2017, Jonathan Frakes revealed that Star Trek: Discovery would be doing a mirror universe episode. [3] [4]
  • CBS All Access is promoting this episode as the start of "Chapter Two", due to premiere eight weeks after the previous episode, which was promoted as the end of "Chapter One". While previous series often had periods which did not see a new first-run episode being broadcast (usually rerunning earlier episodes in the interim), particularly when in syndication, this is the first explicit broadcast break in a Star Trek series, making this the first mid-season premiere in Star Trek history.

Production history

Links and references



Guest Starring


Uncredited co-stars

Stunt double



50 kills; 100 kills; 20th century; accent; adrenal; agony booth; Andorian; bacon; Battle of the Binary Stars; beef stew; beef with mushrooms; black alert; brainwashing; breakfast; Bridge Crew; Burnham, Michael; Buran, ISS; chicken; chicken stew; chocolate cake; chondroblast-cell scan; coconut crisp; Constitution-class; Cooper, ISS; Cooper, USS; coup; Crestian flu; data chip; data core; dinner; Discovery, ISS; Defiant, USS; egg; Elpha; emperor; evasive maneuvers; fascism; femur; First Officer; fish and chips; fruit; galactic center; Galactic Time; ham; ham schnitzel; ice cream; Imperial Starfleet Academy; Isik; Klingon raider; lasagna; laser cannon; lateral vector transporter; Lorca, Gabriel; lunch; Manchurian test; marrow-diminution procedure; Master of Poisons; mirror universe; mycelial network; neurological disregulation; omelet; Organia; Pad thai; personality engram; Porathia; PTSD; pulled pork; Purmata VI; Quam; quantum reality; quantum signature; radius; racism; random memory sampling; salad; Sarcophagus; Sector 006; Shenzhou, ISS; soup; Sorna Prime; spice; spinal cord; Spoeneman; spore drive; Starbase 46; Starfleet; Starfleet Medical Center; Starfleet; steak; Terran Empire; Terran Empire rebellion; Tilly, Sylvia; Valor; vegetable; Vulcan; Vulcan cruiser; witch; worker bee; Wurna Minor; xenophobia; yellow alert; yogurt

External links

Previous episode:
"Into the Forest I Go"
Star Trek: Discovery
Season 1
Next episode:
"The Wolf Inside"
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