Stardate 4768.3: A voice speaks to the crew of the Enterprise and leads the ship to a planet. Deep beneath the surface the consciousnesses of Sargon, Thalassa and Henoch have survived the end of their civilization some 500,000 years ago. In order to be able to construct android bodies for themselves, the three occupy the bodies of Kirk, Dr. Ann Mulhall and Spock. Henoch, however, does not intend to leave Spock's body. He plots to kill Sargon, and Kirk with him. Spock's consciousness seems to be lost when Kirk destroys the globe in which it was stored, attempting to get rid of Henoch. While Sargon and Thalassa are hiding in the ship's computer, Henoch's consciousness is still in Spock's body. But Nurse Chapel administers him an injection that expels Henoch, who now has no place to go to and dissolves. Spock can be recovered, since his mind has been transferred to Nurse Chapel in time. Sargon and Thalassa recognize that they could not live among humanoids and decide to fade into oblivion.

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