Stardate 5928.5: The Enterprise arrives at Camus II, where members of an archeological team have died of an allegedly unknown radiation. While his people investigate the site, Kirk stays at the bed of the ill Dr. Janice Lester, with whom he was once in love. Lester, however, activates an ancient machine that transfers her consciousness into Kirk's body and vice versa. Lester-Kirk is beamed up to the Enterprise with her accomplice, Arthur Coleman, the unconscious body of Kirk-Lester and the unsuspecting landing party. Lester-Kirk and Coleman are waiting for an opportunity to kill Kirk-Lester. But Kirk-Lester regains his consciousness. Spock performs a mind-meld, which convinces him that the person with Lester's body really is Captain Kirk, whereas McCoy finds no evidence that there could be something wrong with the man who appears to be Kirk. Lester-Kirk orders a court martial against Spock, but when McCoy and Scott decide to vote for Spock, she orders their execution. Eventually, however, the emotional stress in her mind reverts the exchange.

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