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Dr. McCoy considers leaving the Enterprise behind in favor of life on a strange planet in this episode from the third season of the popular science fiction series. McCoy's actions are in part motivated by the discovery that he has contracted a rare illness and will soon die. This diagnosis comes immediately before he is called upon to explore, along with Captain Kirk and Mr. Spock, a planet called Yonada. Yonada is in fact not a planet, but a hollowed-out asteroid ruled by the Oracle, a computer who the Yonada residents consider a deity. During their exploration, McCoy strikes up a romantic rapport with one of the civilization's priestesses, who asks the doctor to stay. In light of his impending death, McCoy believes this may be the best way to go, while Spock and Kirk attempt to convince him otherwise.