When Kirk, McCoy, Scotty and Uhura beam back to their own Enterprise, the mirror Spock arrests the mirror Kirk even though Starfleet has ordered him to kill Kirk and take command. While this Kirk conspires with Sulu and Uhura to take back the Enterprise, Spock, McCoy, Marlena, Chekov, and Scotty try to survive their crewmates' plotting, and a Klingon task force. In spite of having control of the Tantalus Field, in the end, Spock must face Kirk alone. See also Forum:Mirror Universe Continuity - Kirk vs. Spock