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Professor Whitaker was a British scientist who developed a working time travel theory.

He applied for a government grant, but was turned down, and after being ridiculed for his ideas, dropped out of the public eye and began secretly working on a machine that could manipulate time.

Whitaker later worked with Sir Charles Grover on Operation Golden Age, but their plans were exposed by the Third Doctor. When Grover activated Whitaker's time machine, both were unaware it had been reprogrammed by the Doctor — resulting in their being sent to an unknown point in the past. (TV: Invasion of the Dinosaurs)