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Penned by noted science-fiction author Theodore Sturgeon, this episode of the famed science-fiction television series depicts the crew of the starship Enterprise relaxing and enjoying time off -- until, that is, their vacation spot provides them with some unexpected surprises. When Dr. McCoy suggests a brief vacation for the crew to relieve stress, Kirk agrees, having found what seems to be the perfect place: a pristine, Earth-like planet without any dangerous animal life. However, once the crew lands, bizarre events begin to occur. On this supposedly uninhabited planet, Sulu finds an ancient gun, Kirk meets an old school rival, and McCoy spots the White Rabbit from Alice in Wonderland. While initially benevolent, these appearances become increasingly strange -- and dangerous. Soon the vacationers appear to be in mortal danger, and Kirk, Spock, and the others must solve the mystery behind these curious encounters before anyone is harmed.