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The six-part Doctor Who adventure "Invasion of the Dinosaurs" begins as the Doctor (Jon Pertwee) and Sarah (Elisabeth Sladen) arrive in London in the not-too-distant future. The two time travelers are surprised to learn that the city is virtually deserted, and what remains has been placed under martial law. Could this disturbing situation have something to do with those disturbing sounds of extremely heavy feet upon the pavement? Written by Malcolm Hulke and first telecast on January 12, 1974, the first episode of "Invasion of the Dinosaurs" was originally titled simply "Invasion," so as not to give away too much of the plot. As a result, the sixth-season story arc "The Invasion" was removed from the BBC archives -- and, unhappily, no longer exists in its complete form.