Stardate 5591.2: The Enterprise returns to the Amusement Park Planet for a shore leave. While the crew are enjoying their fantasies, suddenly the Queen of Hearts and her guards appear, chasing McCoy with spears. When Uhura attempts to save McCoy, a hovering robot carries her to the planet's underground. There she is interrogated by the central computer that rules the planet since the Keeper's death. The computer also sabotages the Enterprise threatening the lives of everyone aboard, thinking that the "sky machine's slaves" are worthless. Kirk, however, can convince the computer that humans and machines may co-exist peacefully.

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