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In the second episode of the six-part story "The Abominable Snowmen," the Doctor (Patrick Troughton) is accused of murder while visiting the Det-sen monastory of Tibet. The actual culprit is an alien being called the Great Intelligence, which holds the Doctor's very old friend Padmasmabhava (Wolfe Morris), and an army of robotic Yeti, in its power. Despite the lack of incidental music in this episode, the tension is thick enough to be cut with a knife. Written by Mervyn Haisman and Henry Lincoln, "The Abominable Snowmen, Episode 2" first aired on October 7, 1967.