Stardate 1672.1: A strange magnetic ore leads to a transporter malfunction that splits Kirk into one aggressive and one cautious person. The two Kirks struggle for the control of the ship, but it also becomes obvious that they are dependent on one another. After the malfunction has been discovered and, moreover, the "evil" Kirk has damaged the transporter circuits, Sulu and his landing party down on the planet can't be beamed up while the temperature is falling rapidly. Spock and Scott devise a method to merge the two Kirks again. When they test it on an alien dog that has been split up in the same fashion, the animal dies because of the stress. But Spock affirms that his intelligence would spare the captain that fate. The two Kirks are re-assembled successfully, and the landing party can be beamed up in time.

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