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
Doctor Who (series 10) the tenth to air following the programme's revival in 2005, and is the thirty-sixth season overall. Preceded by a Christmas special in December 2016, "The Return of Doctor Mysterio", the series is the third and final series starring Peter Capaldi as the Twelfth Doctor, an incarnation of the Doctor, an alien Time Lord who travels through time and space in his TARDIS, which appears to be a British police box on the outside; Capaldi announced in January 2017 that he would be stepping down from the role after the tenth series. The series introduces Pearl Mackie as Bill Potts, the