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Bitter enemies Servalan (Jacqueline Pearce) and Tarrant (Steven Pacey) are stranded on Virn, a planet controlled by living, omnivorous sand. Servalan braces herself for the worst: Her lover, Don Keller (Jonathan David), has already been devoured by the sand, along with several other colonists. For some curious reason, the sand spares the lives of both Servalan and Tarrant -- but the danger has only just begun. "Sand" first aired on November 23, 1981.