Stardate 1533.6: The Enterprise takes over Charlie Evans from the starship Antares. The 17-year-old boy has spent most of his life alone on the planet Thasus as it seems. The inexperienced Charlie develops an interest for Yeoman Rand. It soon becomes clear that he has supernatural powers and uses them against everyone who doesn't give him what he wants, transmuting crew members or making them disappear. When the Antares explodes, it turns out that Charlie has sabotaged the ship. He soon controls the Enterprise too, but Kirk has devised a plan to challenge Charlie, while Spock and McCoy are switching on all systems to weaken the boy. Eventually a Thasian ship appears. The Thasians, who have abandoned their physical bodies ages ago, restore the Enterprise crew to normal and take back Charlie to their planet, as he would not be able to control his powers when among humans.

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