Patrick George Troughton was an English actor. Best known for playing character roles on television, he starred as the second incarnation of the Doctor in the BBC science fiction series Doctor Who from 1966 to 1969, and reprised the role three times between 1972 and 1985. Second Doctor: 5 November 1966 – 21 June 1969. First regular appearance: The Power of the Daleks Episode One. Last: The War Games Episode Ten. Wiki link