Doctor Who : Shada : the lost adventure by Douglas Adams
(Book)

"Based on the BBC television serial by Douglas Adams by arrangement with the British Broadcasting Corporation."

Professor Chronotis has carelessly loaned an immensely powerful book to a clueless graduate student. It cannot be allowed to fall into the wrong hands. The hands of the sinister Time Lord Skagra are unquestionably the wrongest ones possible. Skagra is a sadist and an egomaniac, bent on universal domination. Having misguessed the state of fashion on Earth, he also wears terrible platform shoes.