The Enterprise in attacked by a missile, launched from an asteroid on an independent collision course with highly populated planet, Darren 5, in 396 days, which has simple atomic power and an internal atmosphere, but no inhabitants. McCoy has found he's the only unhealthy crew member: only one year of life left. Kirk, Spock, and McCoy beam down to the asteroid surface but are suddenly overpowered by sword-bearing men, commanded by high-priestess Natira who makes them kneel before a worshiped oracle, which smites them down electrically. They are given a medicine by an old servant who suffers pain twitches while telling them "things are not as they teach us", and that he once climbed the mountain and touched the sky. He then dies. The earthly visitors are now offered hospitality. The high-priestess asks McCoy to stay as her mate and explains the people is on its way to a new, green world, 'soon' according to the oracle. Kirk and Spock discover the oracle was build by the alien Fabrini ... Written by
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When Spock is thumbing through the Book of the Fabrini, although Kirk asks whether it is indexed, and Spock says yes, in fact all pages can clearly be seen to be blank until he reaches the pages he wants. See more
Captain. Intelligence files. Their banks contain the total knowledge of the Fabrini, ready for the people to consult when they arrive at their destination. And they seem to have amassed a great deal of medical knowledge.
Referenced in Free Enterprise