John Devon Roland Pertwee, known professionally as Jon Pertwee, was an English actor. He is best known for portraying the third incarnation of the Doctor in the television series Doctor Who from 1970 to 1974, as well as for starring in the BBC Radio sitcom The Navy Lark (1959–1977) and playing the title role in the television series Worzel Gummidge (1979–1981) and Worzel Gummidge Down Under (1987–1989). Third Doctor: 3 January 1970 – 8 June 1974. First regular appearance: Spearhead from Space Episode One. Last: Planet of the Spiders Part Six. Wiki link