Jon Pertwee 1970 to 1974

In 1969, Pertwee was selected by producer Peter Bryant to take over as the Doctor from Patrick Troughton in the television series Doctor Who. Pertwee had asked his agent to apply for the role for him and was surprised to find he was already on the shortlist for the role. He was the second choice of the producer; Ron Moody was the first but was unavailable.[8] In a departure from the Doctor's first two incarnations, Pertwee played the character as an active crusader with a penchant for action and fancy clothes, even while the character was exiled on Earth and serving with UNIT. He played the Doctor for five seasons from early 1970 to mid-1974, a longer stint than either of his predecessors in the role, William Hartnell and Patrick Troughton, although he appeared in fewer episodes than Hartnell.

Pertwee later reprised the role in the 20th anniversary story The Five Doctors, in two radio adventures and on stage in Doctor Who – The Ultimate Adventure.

The Doctor is a title character and the protagonist of the long-running BBC television science fiction series Doctor Who, and has also featured in two cinema feature films and one made-for-television movie, as well as a vast range of spin-off novels, audio dramas and comic strips connected to the series.
To date, eleven actors have played the role in the television series, with continuity being maintained by the ability of the character's species to regenerate. Several other actors have played the character on stage and film, in audio dramas, and in occasional special episodes of the series. The character's enduring popularity led the Daily Telegraph to dub him "Britain's favourite alien".