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In the second episode of the six-part story "The Seeds of Doom," the Doctor (Tom Baker) and Sarah (Elisabeth Sladen) are stranded in the Antarctic while investigating a series of attacks on an expedition party. The attacks are related to the discovery of a mysterious vegetable pod, which the Doctor identifies as a Krynoid pod -- and, according to him, these things are highly dangerous and always travel in pairs. Meanwhile, a second pod is stolen by the minions of demented horticulturalist Harrison Chase (Tony Beckley). First telecast February 7, 1976, "The Seeds of Doom, Part 2" was written by Robin Banks Stewart.