orders a course change to the Benecia Colony to drop off “Lester” for medical attention, despite the fact that Benecia's medical facilities are comparatively primitive, and that it would unnecessarily interfere with their current mission. McCoy invokes his authority to order a medical examination of the captain, including a personality test. “Lester” regains consciousness and seeks help from Spock and McCoy. “Kirk” slaps her back into unconsciousness, and orders her to be put in isolation. Spock interviews “Lester” and is somewhat skeptical of her story. “Lester” suggests that he use his telepathic abilities to learn the truth, and he is convinced. Spock tries to free “Lester” but is stopped by a security team led by the impostor Kirk, who accuses Spock of mutiny and orders a court-martial. Once on trial, Spock argues that Captain Kirk is really in the body of Dr. Lester. “Kirk” suggests that Spock's real goal is to take command himself and offers to drop charges if Spock will desist. Spock refuses, and “Kirk” flies into a hysterical rage. Shocked by Kirk's behavior, McCoy and Chief Engineer Scott confer secretly in the corridor. Scott believes that if Spock is acquitted, the "captain" won't let the decision stand, making it necessary to mutiny. “Kirk”, having monitored their conversation, declares McCoy, Scott, Spock, and “Lester” guilty of mutiny and condemned to death. On the bridge, Chekov and Sulu, having witnessed the trial, determine to resist the “captain”, and refuse to obey his orders. Loudly accusing them of mutiny, “Kirk” falls into his chair, and an image of Lester emerges from his body, only to return again. “Kirk” runs to Coleman, who tells him that the transfer is reversing itself, and that Kirk, in Lester's body, must die in order to prevent it. The two head to the brig intending to inject “Lester” with a toxic substance. “Lester” resists, and the reversal now completes itself. Realizing she has lost her triple attempt to kill Kirk, destroy her female gender and the ability to command a starship, she suffers a complete mental breakdown; the hysterical Lester begs Coleman to kill Kirk. Coleman then pleads with Kirk to allow him to care for her. Coleman and Lester are escorted to Sickbay. Kirk, Spock, and Scotty proceed to the Bridge and the Enterprise proceeds on its mission. Production "Turnabout Intruder" not only marked the final appearance of all main and supporting cast members