Stardate 3018.2: Two alien beings kill a crewman and hold Scott and Sulu captive on a planet. When Kirk, Spock and McCoy beam down, they enter a castle of horrors created to scare the human crew members. They soon become hostages likewise, guarded by Scotty and Sulu, whose minds are being controlled by the aliens. The aliens even threaten to destroy the ship. However, when their matter transmuter, a technological version of a magic wand, is destroyed, they turn out to be two tiny creatures not able to survive in the planet's atmosphere.

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