Doctor Who and the Infinity Doctors (in-universe)
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Doctor Who and the Infinity Doctors (in-universe) was a book that was cited when the Eighth Doctor mentioned that he was unsure if he had been exiled to his homeplanet, among other possiblities. (PROSE: Bafflement and Devotion)
Behind the scenes
In A Lady Doctor?, a partially licenced Iris Wildthyme short story, Iris Wildthyme mentions to her companion Andrew that the Doctor had previously been a woman in The Infinity Doctors.