Stardate 5476.3: The Enterprise is attacked with ancient missiles, whose point of origin is an inhabited ship in the form of an asteroid. As the asteroid is on a collision course with the planet Daran V, Kirk and Spock beam down to warn the crew of the asteroid. McCoy insists on joining them, although he suffers from an incurable disease, xenopolycythemia, which leaves him just one year to live. It turns out that the inhabitants of the asteroid, Yonada, are not aware that they are on a ship, rather than on a planet. High Priestess Natira falls in love with McCoy. When Kirk and Spock are caught examining Yonada's "Oracle", they are due for execution, but McCoy convinces Natira to let them go, while he himself decides to spend the time that is left to him on Yonada. But soon he discovers a book of ancient knowledge and contacts the Enterprise. Kirk and Spock manage to gain access to the control room and correct the asteroid's course. And they also find a cure for McCoy in Yonada's databanks.

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