When Kirk, McCoy, Scotty and Uhura beam back to their own Enterprise, Spock arrests Kirk even though Starfleet has ordered him to kill Kirk and take command. While Kirk conspires with Sulu and Uhura to take back the Enterprise, Spock, 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.