In answering a medical emergency at an archaeological expedition, Kirk confronts the deep hatred of an old love, Janice Lester, who supposedly lies severely ill from celebium radiation. In payment for jilting her back at Starfleet Academy, Dr. Lester arranges for an alien machine to swap her consciousness with that of the captain and takes command of the Enterprise. Once aboard, Kirk (in Lester's body) tries to convince Spock that he is trapped in her body. As a result, Janice (in Kirk's body) conducts a court-marshal with the intent of executing Spock and Kirk (in Janice's body), and later McCoy and Scott, to keep her secret. The crew realize something is seriously wrong with their captain and, not wishing to incur an illegal death-penalty themselves, begin a passive resistance. Written by
Did You Know?
"Turnabout Intruder" which is the final episode of The Original Series, takes place in 2269, 4 years before Star Trek: The Motion Picture
(1979) which took place in 2273, even though they were released 10 years apart. See more
When Spock and McCoy are conversing in sickbay, McCoy is wearing his medical garb. However, in the first couple of close-ups, his shirt changes to his regular uniform. See more
She is suffering from the delusion of being Captain Kirk.
James T. Kirk
[in Janice Lester's body
I am NOT Janice Lester!
The paranoia has been developing for the past six months. The radiation seems to have intensified it. She must be kept sedated.
Nurse Christine Chapel
Shall I prepare a mild sedative, Doctor?
Spoofed in Kim Possible: Mind Games