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.
by Hal Erickson synopsis