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In the fifth episode of the six-part story "The Seeds of Doom," the Doctor (Tom Baker) saves Sarah (Elisabeth Sladen) from being infected by the Krynoid seeds. Unfortunately, mad plant-fancier Harrison Chase (Tony Beckley) succeeds in transforming his assistant Keeler (Mark Jones) into a host body for the voracious Krynoids. Before long, the Krynoid influence has spread throughout all plants within a one-mile radius of Chase's home -- and from the looks of things, mankind is doomed to destruction. First telecast February 28, 1976, "The Seeds of Doom, Part 5" was written by Robin Banks Stewart.