Stardate 4187.3: Spock, Uhura and Sulu transport a stasis box of a billion-year-old race called the "Slavers" in the shuttle Copernicus. The Slaver box acts as a detector for a second one, which Spock hopes to find on a nearby planet. The second box, however, is empty and has been placed there as a trap by the Kzinti, old enemies of the Federation. The Kzinti keep trying to find out the secret of the device inside the box, which they hope is a powerful weapon. The Kzinti are finally killed when they inadvertently activate the self-destruct mechanism of the Slaver weapon.

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