AllMovie

Thanks to a freak accident involving the Enterprise's transporter device, Captain Kirk is split into two separate bodies, each with its own personality, in this installment of the popular television series. The two Kirks represent opposite aspects of the Captain's personality: one who is aggressive, forceful, and callous, the other caring, sympathetic, but also indecisive and weak. The two men vie for control of the ship, leaving the Enterprise without a definite commander. Meanwhile, the rest of the landing party, led by Sulu, remains stranded on the planet's surface until the transporter can be repaired. Spock, Scotty, and the others must find a way to reunite the halves of Kirk's personality and rescue the others before nightfall arrives, bringing with it extreme cold that could mean the landing party's death.