Jon Pertwee played the third Doctor from 1970 until 1974 and was born in 1919. Later in his life he was well known for playing Worzel Gummage until 1989. He was born into a family somewhat in the film and theatre business as the son of screenwriter Roland Pertwee. He was married twice and had a close miss in the Second World War, where he was in the Royal Navy, and served on HMS Hood, only being transferred off the ship shortly before she was sunk by the German battleship Bismark, losing all but 3 of the crew. After the war he made a name for himself on Radio, and was the star of a fair few radio shows. He slowly progressed into smaller television roles.
In 1970 the then leaving producer of Doctor Who, Peter Bryant and the incoming new producer Derrick Sherwin both agreed to star Jon Pertwee as the Doctor to take over from Patrick Troughton. Pertwee had asked his agent to put him forward for the role, however he was not the first choice. Ron Moody was the first choice but was unavailable at the time, so Pertwee took the role. He starred as the Doctor for a longer time than the first 2 Doctors, but did not star in as many episodes as William Hartell as the BBC started to shoot less episodes per series.
Pertwee said that he would just play himself Jon Pertwee as the Doctor and that the series helped him find his own true identity. By early 1974 however Pertwee announced he would be stepping down from the role, partly due to fears of type casting, and partly due to the death of his co star Roger Delgado and the leaving of other crew members. He handed over the role to Tom Baker, who would go on to be one of the most popular Doctor's.
He would play the Doctor once more in the 1983 special The Five Doctors, and carry on starring in theatre and stage productions.