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                  | Turnabout Intruder |  
                  | Production Number | 79 |  
                  | Air Date (US) | 1969-06-03 |  
                  | Season | 3 |  
                  | DVD Disc No. | 6 |  
                  | Rating |     |  
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                  | Cast: William Shatner as James T. Kirk
 Leonard Nimoy as Spock
 DeForest Kelley as Leonard H. McCoy
 James Doohan as Montgomery Scott
 Walter Koenig as Pavel Andreievich Chekov
 George Takei as Hikaru Sulu
 
 Guest Cast:
 Sandra Smith as Dr. Janice Lester
 Harry Landers as Dr. Arthur Coleman
 Majel Barrett as Christine Chapel
 Barbara Baldavin as Communications Officer
 David L. Ross as Lt. Galloway
 John Boyer as Guard
 Majel Barrett as Computer Voice
 
 Creative Staff:
 Director:  Herb Wallerstein
 Teleplay By: Arthur H. Singer
 Story By: Gene Roddenberry
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                | Description |  
                | Dr. Janice Lester, who was once involved with Captain Kirk, harbors a deep hatred of the captain, because she, herself, has never been able to captain a starship. On their way to Beta Aurigae, the U.S.S. Enterprise receives a call for help from Camus II. The landing party finds only Janice Lester and Dr. Coleman, who claim that the everyone else was killed by celebium radiation. In fact, Janice is quite ill from it. Unaware of Lester's feelings of hatred toward him, Kirk sits with her, recalling their days together. Kirk is suddenly trapped into a life-entity transfer with Janice. His personality is in her body, while she takes over his, finally becoming captain of a starship. Kirk, with Janice's essence, tries to kill her victim, but fails. McCoy transports Janice, with Kirk's essence, to sickbay to try and treat her illness. While Kirk, trapped in Janice's body, tries to convince everyone that he's really the captain, Janice takes control of the ship and diverts it to the Benecia Colony. There she plans to leave her body, that houses Kirk's essence, thereby eliminating all her problems.
 
 The crew becomes suspicious of her actions and, when Spock tries to question her, she charges him with mutiny. They realize something is wrong and Janice/Kirk is relieved of duty. When the transfer weakens and finally breaks, Kirk returns to his body, as Janice's essence returns to hers. Janice makes a last attempt to hurt Kirk, then collapses. Dr. Coleman, in love with Janice, requests that he be allowed to care for her. The U.S.S. Enterprise and her crew return to their mission, with their rightful captain at the helm.
 
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                | Trivia |  
                | The series final show, "Turnabout Intruder" was pre-empted and did not air until June 3, 1969, three months after the airdate of the previous episode. Watch the scene in the sickbay between Spock and McCoy. In some shots, McCoy is wearing his uniform top; in others, his surgical top!
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