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The citizens of Moon Ridge, Colorado are convinced that an unearthly monster has invaded their town. What other explanation can there be when a mentally challenged girl named Emily Bella (Natalie Norwick) suddenly disappears, and a set of strange footprints are found outside her room? Though Paladin (Richard Boone) is not by nature superstitious, even he is stymied by the situation--at least until the final scene. This episode was written by Gene Roddenberry, who several years later would channel his fascination in all things supernatural into his own series, Star Trek.