 Khan is placed under guard in quarters . McGivers is sent to brief him on current events . Taking advantage of McGivers ' attraction towards him , Khan tells her he means to rule mankind again and needs her help to take over Enterprise . Reluctantly , she agrees , beaming Khan to Botany Bay , where he revives the rest of his superpeople . They return to Enterprise and assume control of the ship . Khan throws Kirk into a decompression tank , and threatens to slowly suffocate him unless Kirk 's command crew agree to follow Khan . Having a change of heart , McGivers frees Kirk from the chamber . Kirk and Spock vent anesthetic gas throughout the entire ship to disable Khan and his cohorts . Khan escapes the gas and heads to Engineering , where he attempts to destroy Enterprise , but Kirk confronts him and a brawl ensues . Though outmatched by Khan 's superior strength , Kirk uses a tool as a club to knock the superman unconscious . 
