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The original doctor, the First Doctor, played by William Hartnell, was in seasons 1 to 4 (1963 - 1966) & returned in "The Three Doctors" (season 10, 1972 - 1973), "The Five Doctors" (1983), in which he was played by Richard Hurndall, "The Name of the Doctor" & "The Day of the Doctor" (Series 7, 2013) & "Listen" (Series 8, 2014), as a child, played by an uncredited actor.