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"The Changeling" was the 37th episode of Star Trek: The Original Series, the 8th episode of the show's second season, first aired on 29 September 1967. The episode was written by John Meredyth Lucas, directed by Marc Daniels and novelized in Star Trek 7 by James Blish.



Episode characters

Clifford Brent[1]CarlisleChristine ChapelBill HadleyJames T. KirkRoger LemliRyan LeslieLeonard McCoyNomadMontgomery ScottHayden SinghSpockHikaru SuluNyota UhuraVinci[2]
Referenced only
ManwayJackson RoykirkTan Ru

Novelization characters

Christine ChapelJames T. KirkLeonard McCoyNomadMontgomery ScottHayden SinghSpockHikaru SuluNyota Uhura
Referenced only
Jackson Roykirk

Starships and vehicles

USS Enterprise (Constitution-class heavy cruiser)

Races and cultures

Referenced only

States and organizations


Science and classification

anatomyarmatmospherebloodfingergashumanoidlifeformmatterorbitoxygenspacestarSymbalene blood burnuniverse

Technology and weapons


Ranks and titles

captaincommandercommanding officercommunications officerFederation Starfleet ranksFederation Starfleet ranks (2260s)first officerlieutenant commanderofficerscientistscience officer

Other references

Beyond AntaresbootclothingFederation membersfive-year missiongovernmentlanguagelogicmemorynation-statepantsquadrantraces and culturesrankstardateStarfleet uniformStarfleet uniform (2260s)technologytitletunicuniformweapon


Related media

Jackson Roykirk later appeared in the following adventures:





published order
Previous episode:
Wolf in the Fold
TOS episode produced Next episode:
The Apple
Previous episode:
Who Mourns for Adonais?
TOS episode aired Next episode:
Mirror, Mirror
Previous story:
Who Mourns for Adonais?
Star Trek 7
Next story:
The Paradise Syndrome
chronological order
Previous Adventure:
Across the Universe
Pocket Next Adventure:
See No Evil
Previous Adventure:
Wolf in the Fold
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
The Apple

External links

  1. This character was not named in the episode but the same actor, wearing an officer's Starfleet uniform, was addressed as Brent in TOS episode: "The Naked Time". The same actor also played the character of Vinci.
  2. This character was not named in the episode but the same actor, wearing the same operations division Starfleet uniform, was addressed as Vinci in TOS episode: "The Devil in the Dark". The same actor also played the character of Clifford Brent.