Editing Turnabout Intruder (section)

==Plot==
The [[United Federation of Planets|Federation]] [[starship]] ''[[USS Enterprise (NCC-1701)|Enterprise]]'' answers a distress call from the [[planet]] Camus II, the site of an [[Archaeology|archaeological expedition]]. Among the survivors are Dr. Janice Lester, with whom [[James T. Kirk|Captain Kirk]] was once intimately involved, and the expedition's physician, Dr. Arthur Coleman. Coleman claims that Lester is suffering from [[Acute radiation syndrome|radiation exposure]].

While Lester and Kirk are alone they reminisce about their time together at Starfleet Academy. Lester blames sexism within Starfleet for her failure to become captain. When Kirk explores the room, she activates an alien machine that traps and paralyzes him. She then enters the machine herself and the machine switches their life-entity. The new "Kirk" declares that he will take command of the Enterprise and begins to strangle "Lester" but the returning Spock and McCoy interrupt him.

Back on the ship, over McCoy's protests, "Kirk" gives Dr. Coleman full authority for treatment of "Lester" and it is revealed that Lester and Coleman conspired to kill the expedition's personnel.

Spock becomes suspicious when "Kirk" 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 [[Montgomery Scott|Scott]] confer secretly in the corridor. Scott believes that if Spock is acquitted, the "captain" will not 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, [[Pavel Chekov|Chekov]] and [[Hikaru Sulu|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 gain 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.