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
Appearances: 41 stories (172 episodes)
Companions: Sarah Jane Smith; Harry Sullivan; Leela; K9; Romana; Adric; Nyssa; Tegan Jovanka
Introduced by: Barry Letts
No of series: 7
Tenure: 28 December 1974 – 21 March 1981