Third Doctor
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The Third Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He was portrayed by actor Jon Pertwee. Wikipedia
Played by: Jon Pertwee
TV show: Doctor Who
Chronology: Season 7 (1970); Season 8 (1971); Season 9 (1972); Season 10 (1972–1973); Season 11 (1973–1974); Season 20 (1983)
Companions: Liz Shaw; Jo Grant; Sarah Jane Smith
First regular appearance: Spearhead from Space (1970)
Introduced by: Derrick Sherwin
Last regular appearance: Planet of the Spiders (1974)