The Apple
Summary
The crew of the Enterprise visits a mysterious and deadly paradise planet which they discover is controlled by a machine called Vaal. The landing party, which includes Kirk, Spock, Bones and Chekov, are enchanted by the planet but encounter a strange flower that kills two members of the party. A mysterious bolt of lightning hurts Spock and disrupts the transporter room of the Enterprise. The surviving landing party finds a group of men and women who are controlled by Vaal. Vaal restricts their knowledge of human interactions such as sexual intercourse and has the island's inhabitants feed it an explosive mineral found on the island in order to fuel itself. Vaal orders the inhabitants to kill the landing party by morning when it becomes clear that they represent a threat to the inhabitants' current way of life.
Summary from Wikipedia, CC BY-SA 4.0.
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