A Man of Two Minds was a novel written by Jackson Lake and published in 1860. It featured "the Doctor", "Mr Smith", and the Cybermen. Though ostensibly fictional, many speculated it was actually an autobiographical account of Lake's true experiences. (PROSE: The Secret Lives of Monsters) Jackson Lake did in fact have a period where he believed himself to be the Doctor and encountered the Cybermen. (TV: The Next Doctor)
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