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Blake (Gareth Thomas) and four of his crew members are captured by a hostile tribe on the planet Horizon and forced to work in the mines. Hoping to free his comrades -- and to flush out a hidden Federation Freighter -- Blake tries to convince Ro (Darien Angendi), leader of the tribe, that he is being used as a dupe by the villains. And back on the Liberator, Avon (Paul Darrow) is besieged by Federation pursuit ships. "Horizon" originally aired on January 30, 1979.