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In the third episode of the six-part story "The Abominable Snowmen," the Doctor (Patrick Troughton) has learned that the Tibetan monastery of Det-sen is being held in thrall by the malevolent Great Intelligence. He also now knows that his alien adversary intends to use an army of Yeti robots to take over the world. But he doesn't what to do about it -- especially since one of his oldest friends is unwillingly mixed up in the intrigue. Written by Mervyn Haisman and Henry Lincoln, "The Abominable Snowmen, Episode 3" first aired on October 14, 1967.