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"My oath of celibacy is on record, Captain. May I assume my duties?"
Ilia to James T. Kirk, 2270s (Star Trek: The Motion Picture)

Lieutenant Ilia was a female Deltan Starfleet officer in the 23rd century. She was in the navigation and helm branches of the Operations division. In the mid-2270s, she served aboard the USS Enterprise under the command of Captain James T. Kirk.

Years before her assignment, she had been romantically involved with Will Decker on her home planet Delta IV. She would meet him again on the Enterprise. She did, however, swear an oath of celibacy upon initiation of her service, a requirement for Deltans entering Starfleet.

In the aftermath of an attack by V'ger on the Enterprise, she soothed the nerves in Pavel Chekov's hand and wrist before Christine Chapel tended him.

Although Ilia was absorbed by the V'ger probe, V'ger created another probe that was an artificial near-duplicate of her to collect information and act as a liaison between V'ger and the "carbon units" that "infested" the Enterprise. The probe mentioned that the Ilia unit was "no longer functioning". The duplicated Ilia probe was similar to Ilia down to the molecular structure, as a medical exam later revealed. The probe included both her memories and personality, though both suppressed by V'ger's programming.

When Spock entered V'ger's interior wearing a thruster suit, he saw a representation of Ilia floating in the expanse and attempted a mind meld.

Kirk later listed both Ilia and Will Decker as missing instead of killed, following the involvement of both in the conclusion of the crisis. (Star Trek: The Motion Picture)

Quick Answers

What is the home planet of Ilia from Star Trek? toggle section
Ilia, a Star Trek character, originates from Ilidaria, a planet in the Delta Quadrant's Ilidaria system. The planet, less than three light years from a type-4 quantum singularity, is home to the warp-capable Ilidarian civilization.
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What role did Ilia play in the USS Enterprise? toggle section
Lieutenant Ilia, a Deltan Starfleet officer, served as a Navigator on the USS Enterprise in the 23rd century. She was part of the Operations division's navigation and helm branches. Later, she was assigned to the USS Enterprise-D from 2364 to 2370, welcoming Captain Picard upon his command takeover. Ilia participated in the Devron system mission and attended Data's poetry reading in Ten Forward.
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Who was Ilia romantically involved with before her assignment on the USS Enterprise? toggle section
Ilia, from 114-Delta V, was romantically linked with Lieutenant Will Decker. Their relationship was deeply emotional and physical, reflecting Ilia's Deltan cultural norms. Decker, focused on his space exploration career, ended their relationship abruptly. When they met again on the USS Enterprise, Ilia's unresolved feelings were evident.
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What is unique about Deltan Starfleet officers like Ilia? toggle section
Ilia, a Deltan Starfleet officer, stands out due to her interest in human culture and space exploration, a contrast to her Deltan kin who have lost interest in space voyages. Her advanced Deltan intelligence enables her to handle intricate aspects of space navigation, serving in the navigation and helm branches of the Operations division. Moreover, she has a recorded oath of celibacy.
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Why is Ilia referred to as the 'Star Trek bald woman'? toggle section
Ilia, a Star Trek character, is termed the 'Star Trek bald woman' because she is hairless. She originates from Planet 114-Delta V and belongs to the Deltan race, which predates humans. Her superior skills in art and mathematics contribute to her role as an exceptional navigator.
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Appendices[]

Background information[]

Fred Phillips shaving Persis Khambatta

Persis Khambatta having her hair shaved off by Fred Phillips, in preparation for playing Ilia

Persis Khambatta screen tests for her role as Ilia

Persis Khambatta (bottom, in yellow) screen tests for her role as Ilia

Ilia was played by Persis Khambatta. The character was originally proposed for Star Trek: Phase II. The show's production materials described the character's abilities and background – notably, that she was very intelligent, an "esper" and that almost everything with her people was sex-oriented. Khambatta had been cast in the role for the series, and had done costume and makeup tests which were used for the motion picture. (The Making of Star Trek The Motion Picture (page number?edit))

According to The Making of Star Trek The Motion Picture (pg. 108), Ilia grew up with a strong interest in culture of Earth:

Ilia is different from other Deltans in only one area–as a girl, she had considerable contact with Humans because of her father's prominence as a Federation historian with special interest in parallels between civilizations of Earth and Delta. Something of a dreamer, Ilia eventually became fascinated with the "primitive" heroic qualities in Humans–this led to an interest in 23rd-century space exploration, in much the same way some Humans become intrigued with the heroic ocean voyages of the Polynesian people.

Since her own Deltan race had long ago lost interest in space voyaging (concentrating on their own inner-space), Ilia finally decided to join Starfleet herself and study at first hand the space adventuring in which the Human species were playing so prominent a role. As is true of the few other Deltans who have joined Starfleet, Ilia's natural job function was navigation--the highly evolved Deltan intelligence can handle the most complex spherical trigonometric complexities of space navigation as easily as a Human learns simple multiplication tables.

Ilia's past connection with Decker is a bit troubling to her. She met Decker while still little more than girl--her romantic "dreamer" nature saw him loom in her mind as a handsome, primitive young warrior, excitingly different from any Deltan man she knew. She then discovered that this "primitive young warrior" had unusual intelligence and charm. All this combined with Ilia's burgeoning interest in Earth voyages and voyageurs–her emotional Deltan zest catapulted her into love with this young Starfleet lieutenant. But Decker, already an experienced officer, knew of the dangers implicit in any such relationship–he also recognized that his own principal need was for the challenge and adventure he could find only in space as a starship commander some day. When Ilia's interest in him led to preliminary love-play, even the unconsummated sex experience left him so shaken, that he saw the trap in time. He fled, realizing he could not risk even a "good-bye"--another hour with Ilia might have brought him to a point of no return.

Ilia is now certain that Decker made the right decision–her affection for him was genuine, deep enough that she saw it would be selfish of her to interfere with his chance of one day achieving the ultimate freedom and challenge of starship command. Decker is equally certain he made the right decision about Ilia–and yet, strangely exotic and compelling memories of her still torment him at times.

Ilia, as well as her relationship with Will Decker, was the inspiration for both the Betazoid character Deanna Troi and Troi's relationship with the Human William T. Riker. This includes the Betazoids, like the Deltans, being named after a character in the Greek alphabet, their relatively very open attitude toward sexual activities, and their ESP (Extra Sensory Perception) capability (manifesting in Troi primarily as empathy).

In the DVD commentary for the Director's Cut, director Robert Wise suggested Ilia was a last-minute replacement for the unnamed transporter accident victim who was killed earlier with Commander Sonak. Decker's surprised reaction at her arrival seemed to support this.

In the shooting script, Ilia's rank was Lieutenant junior grade. [1] This rank was mentioned in the Gene Roddenberry's novelization of Star Trek: The Motion Picture.

Apocrypha[]

Ilia can also be seen in the first two story arcs of the Star Trek newspaper comic strip.

In The Return, by William Shatner, it was revealed that V'ger was modified by the source species of the Borg. It was suggested that Ilia and Decker were fused to the Borg Collective, in five-dimensional space, by V'ger and that Ilia might be the Borg Queen seen later.

According to the video game Star Trek: Starship Creator, Ilia's father is named Serilli and her mother is named Cherlas. She has a brother named Senn and a sister named Anya.

Her mirror universe counterpart was depicted as being a crewmember aboard the ISS Enterprise in The Sorrows of Empire. She was likewise the lover of Willard Decker. She was killed by Marlena Moreau using the Tantalus field in 2272.

The prime universe Ilia resurfaces in Star Trek Online. In the mission "Red Shift", released in January 2022 for the game's 12th anniversary, Ilia suddenly appeared in 2411 in the Epsilon sector, before falling comatose; she was later transported to Jupiter Station and kept in stasis. Ilia appears to still be in her V'ger probe form, as the researchers comment on the advanced technology of her form making Soong-type androids "crude" by comparison. The Terran Empire sends a team - the mirror counterparts of Kathryn Janeway, Sylvia Tilly, Kuumaarke, and the player character, known as the "Inquisitor" - to claim Ilia as a "prize" for Emperor Wesley Crusher. In the later missions "Blue Shift" and "The Calling", Ilia is rescued from the Terran Spacedock by the player character, Marshal Janeway, and Admiral Leeta, and awakens in Jupiter Station's medical bay. She informs the player that the Emperor seeks "the Other", the mirror universe's version of V'ger. In the concluding mission "The Fujiwhara Effect", Ilia summons V'ger to Earth to stop "the Other" and Emperor Crusher before they devastate Earth.

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