The Third Doctor is the third incarnation of the protagonist of the long-running BBC television science fiction series Doctor Who. He was portrayed by actor Jon Pertwee.
Within the series' narrative, the Doctor is a centuries-old Time Lord alien from the planet Gallifrey who travels in time and space in his TARDIS, frequently with companions. When the Doctor is critically injured, his body automatically regenerates; as a result, his physical appearance and personality change.
Read more about Third Doctor: Personality, Story Style, "Reverse The Polarity", Title Sequence and Logo, Later Appearances, Other Mentions, Other Appearances
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“The conscience of the world is so guilty that it always assumes that people who investigate heresies must be heretics; just as if a doctor who studies leprosy must be a leper. Indeed, it is only recently that science has been allowed to study anything without reproach.”
—Aleister Crowley (1875–1947)