Which Star Trek characters who were main cast in their respective shows haven't been transformed into a species different from their usual one by any means? E.g. alien virus, cosmetic surgery for infiltration, holographic trickery, etc.

I would include Tasha Yar as a transformation because of Sela and the Enterprise-D's reaction to her. I wouldn't include Ethan Philips' first appearance as a Ferengi, but I would when Neelix was made up to look like a Ferengi in False Profits since the first was a separate character and the second was clearly Neelix in disguise. Basically, if the characters who know them best would recognise them as the same character (even mistakenly), they should be included.

I can't remember Dr Crusher or Worf ever being transformed into other species (OK, I just remembered Genesis for Worf), but my memory could be faulty. I would prefer only screen appearances, not comics or books or other appearances.

  • 2
    @Adamant - What about Riker becoming a Q?
    – Valorum
    Commented Nov 16, 2022 at 7:14
  • 2
    Speaking of Q, he turned Dr. Crusher into a dog
    – Valorum
    Commented Nov 16, 2022 at 8:00
  • 1
    @Adamant - Christmas does appear to still exist since Picard was celebrating it in the Nexus (and since the Nexus is trying to convince you it's real it's safe to assume it didn't just create a hallucination of a forgotten 20th century fad). However since CJ asked for only on-screen appearances and I don't believe Picard ever did this on screen, I would say it doesn't count.
    – komodosp
    Commented Nov 16, 2022 at 8:55
  • 1
    @orange - TNG I think you could argue that almost all of the senior crew except Wesley was transformed at one point or another. Less so in DS9 and Voyager, almost never in Enterprise, STD or STP
    – Valorum
    Commented Nov 16, 2022 at 10:42
  • 10
    Sela shouldn't count - she was Yar's daughter. Not Yar transformed. That inclusion conflates actor w/ character and expands / muddies the question
    – NKCampbell
    Commented Nov 16, 2022 at 16:54

1 Answer 1


Characters organised by TV show they had main cast billing. Repeats are omitted. Spoilers are unhidden.

Those in bold have never been visually transformed into another species on screen. Only one example is given to discount people.

Star Trek

  • James T. Kirk - disguised as Romulan in The Enterprise Incident
  • Spock
  • Leonard McCoy
  • Montgomery Scott
  • Nyota Uhura
  • Pavel Chekov
  • Hikaru Sulu

Star Trek: The Animated Series

  • Christine Chapel

Star Trek: The Next Generation

  • Jean-Luc Picard - disguised as a Romulan in Unification
  • William Riker - disguised as a Mintakan in Who Watches The Watchers
  • Geordi La Forge - transformed into Tarchanne in Identity Crisis
  • Tasha Yar* - half-Romulan daughter in Redemption
  • Worf - disguised as a Boraalan in Homeward
  • Beverly Crusher - transformed into a dog in True Q
  • Deanna Troi - disguised as a Romulan in Face of the Enemy
  • Data - disguised as a Romulan in Unification
  • Wesley Crusher

* counts by the question's clarifications, but I disagree

Star Trek: Deep Space Nine

  • Benjamin Sisko - disguised as a Klingon in Apocalypse Rising
  • Odo - almost always when not in the Great Link
  • Jadzia Dax - disguised as a human in Trials and Tribble-ations
  • Jake Sisko
  • Miles O'Brien - disguised as a Klingon in Apocalypse Rising
  • Quark
  • Julian Bashir
  • Kira Nerys - disguised as a Cardassian in Second Skin
  • Ezri Dax

Star Trek: Voyager

  • Kathryn Janeway - transformed repeatedly in Threshold
  • Chakotay - disguised as a Vidiian in Faces
  • B'Elanna Torres - assimilated by the Borg in Unimatrix Zero
  • Tom Paris - transformed repeatedly in Threshold
  • Kes - transforms into an energy being in The Gift
  • Neelix - disguised as Ferengi in False Profits
  • The Doctor - takes the appearance of Seven of Nine in Body and Soul
  • Tuvok - assimilated by the Borg in Unimatrix Zero
  • Seven of Nine - Borg implants removed until almost human in The Gift
  • Harry Kim - Infected by Species 8472 in Scorpion

Star Trek: Enterprise

  • Jonathan Archer - transformed into a Loque'eque in Extinction
  • T'Pol
  • Phlox
  • Malcolm Reed - disguised as a Suliban in Detained
  • Travis Mayweather
  • Hoshi Sato - transformed into a Loque'eque in Extinction
  • Charles "Trip" Tucker III

Star Trek: Discovery

  • Michael Burnham - disguised as a Trill hologram in Su'Kal
  • Saru - disguised as a human hologram in Su'Kal
  • Voq - disguised as a human for most appearances
  • Paul Stamets
  • Sylvia Tilly
  • Gabriel Lorca
  • Hugh Culber - disguised as a Bajoran hologram in Su'Kal
  • Christopher Pike
  • Nhan
  • Cleveland "Book" Booker
  • Jett Reno
  • Adira Tal

Star Trek: Picard

  • Agnes Jurati - assimilated by the Borg in Fly Me to the Moon
  • Kore Soong (and androids)
  • Narek
  • Raffi Musiker
  • Chris Rios
  • Elnor
  • Laris
  • Tallinn - disguised as a Human in Farewell
  • Adam Soong

Star Trek: Lower Decks

  • Beckett Mariner - disguised as an Orion in We'll Always Have Tom Paris
  • Brad Boimler
  • D'Vana Tendi - transformed into a giant scorpion in The Spy Humongous
  • Sam Rutherford
  • Carol Freeman
  • Jack Ransom - transformed into a giant head in Strange Energies
  • Shaxs
  • T'Ana

Star Trek: Strange New Worlds

  • La'an Noonien-Singh
  • Erica Ortegas
  • Joseph M'Benga
  • Hemmer
  • Una Chin-Riley
  • 4
    Picard - does borgification count?
    – NKCampbell
    Commented Nov 16, 2022 at 16:54
  • 4
    Spock - disguised as a Romulan in Unification. Wesley - evolves into a Traveler. Odo - transformed into a solid, then disguised as a Klingon.
    – Pete
    Commented Nov 16, 2022 at 17:02
  • 6
    Spock pretended to be human in City On The Edge Of Forever, and The Voyage Home.
    – Pete
    Commented Nov 16, 2022 at 17:35
  • 3
    @Pete but did he change his appearance, or did he just wear a hat?
    – OrangeDog
    Commented Nov 16, 2022 at 17:36
  • 5
    Quark - becomes human in Far Beyond the Stars. (Also Dukat and Weyoun - regular characters, even if antagonists)
    – Pete
    Commented Nov 16, 2022 at 17:49

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