Third Doctor See List of non-televised Third Doctor stories. Third Doctor The Third Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television series "Doctor Who". He was portrayed by actor Jon Pertwee. Within the series' narrative, the Doctor is a centuries-old Time Lord alien from the planet Gallifrey who travels in time and space in his TARDIS, frequently with companions. At the end of life, the Doctor can regenerate his body; as a result, his physical appearance and personality change. Pertwee portrays the third such incarnation, a dapper man of action of stark contrast to his
The Ark (Doctor Who) The Ark (Doctor Who) The Ark is the fifth serial of the third season of the British science fiction television series "Doctor Who", which was first broadcast in four weekly parts from 5 to 26 March 1966. The serial is set in the far distant future, at least ten million years. In the first two episodes of the serial, the time traveller the First Doctor (William Hartnell) and his travelling companions Steven Taylor (Peter Purves) and Dodo Chaplet (Jackie Lane) arrive on a generation ship Dodo names "the Ark", where the Doctor searches for a cure for a fever that