Stardate 5483.7: The Enterprise enters an uncharted sector of space where Federation and Klingon vessels have been reported missing every 27 years. While in the Taurean system, signals cause the male crew to hallucinate about beautiful women. Kirk, Spock, and McCoy beam down to the source of the signals, but are taken prisoners by the inhabitants, entirely consisting of beautiful women. They are aging rapidly as a result of life-draining headbands they are forced to wear. Uhura takes command of the ship and leads an all-female landing party to rescue the men. The siren women need to replenish their own life force every 27 years on the planet. Kirk agrees to transport the women to a safe world where they will again prosper, but begin to age.

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