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"Turnabout Intruder" was the 79th episode of Star Trek: The Original Series, the 24th and final episode of the show's third and final season, first aired on 3 June 1969. The episode was written by Gene Roddenberry and Arthur H. Singer, directed by Herb Wallerstein and novelized in Star Trek 5 by James Blish.


A self-hating woman and ex-lover of James T. Kirk has a double revenge: switch consciousnesses with Kirk and then kill Kirk in her "old body"!



Episode characters

Christine ChapelPavel ChekovArthur ColemanDavid GallowayBill HadleyJames T. KirkRoger LemliJanice LesterLisaLeonard McCoyMontgomery ScottSpockHikaru Suluunnamed 2260s USS Enterprise personnel

Novelization characters

Christine ChapelPavel ChekovHoward ColemanJames T. KirkJanice LesterLeonard McCoyMontgomery ScottSpockHikaru SuluNyota Uhura

Starships and vehicles

USS Enterprise (Constitution-class heavy cruiser)


Benecia ColonyBeta AurigaeCamus IIStarbase 2

Races and cultures


Technology and weapons


Materials and substances


States and organizations


Ranks and titles

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

Other references

anatomyarmbootclothingFederation membersfingerfive-year missiongovernmenthumanoidlanguagelifeformlogicmattermemorynation-stateorbitpantsquadrantraces and culturesrankspacestarstardateStarfleet uniformStarfleet uniform (2260s)technologytitletunicuniformuniverseweapon


Related media

This episode is later referenced in the TOS novel, Assignment: Eternity, as the novel takes place a week after this episode.

The Star Trek: Enterprise novel What Price Honor? implies that the mind-swapping technology seen in this episode comes from a race called the Anu'anshee.


Video releases


Episode images

Adaptation images



published order
Previous episode:
All Our Yesterdays
TOS episode produced Next episode:
last episode produced
Previous episode:
All Our Yesterdays
TOS episode aired Next episode:
The Cage
Previous story:
This Side of Paradise
Star Trek 5
Next story:
Requiem for Methuselah
chronological order
Previous Adventure:
Faces of Fire
Memory Beta Chronology Next Adventure:
Captain's Personal Log
Previous Adventure:
Faces of Fire
Pocket Next Adventure:
Assignment: Eternity
Previous Adventure:
All Our Yesterdays
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
Captain's Personal Log

External links