Fourth Doctor
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The Fourth Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is portrayed by Tom Baker. Wikipedia
Played by: Tom Baker
Hat type: fedora
Companions: Sarah Jane Smith; Harry Sullivan; Leela; K9; Romana; Adric; Nyssa; Tegan Jovanka
First regular appearance: Robot (1974–1975)
Introduced by: Barry Letts
Last regular appearance: Logopolis (1981)
No of series: 7