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 Doctor (Doctor Who) Fifth Doctor in "Castrovalva" (1982), the character was credited as "The Doctor", which he had been referred to in-universe since the tenure of William Hartnell. This credit remained from season 19 to season 26. In the television movie, the trend is continued, with Paul McGann's debuting Eighth Doctor credited as "The Doctor" and Sylvester McCoy's out-going Seventh Doctor as "The Old Doctor". The 2005 resurrection of the programme credited Christopher Eccleston – playing the Ninth Doctor – as "Doctor Who" again in series 1. "The Parting of the Ways", featuring the Ninth Doctor's regeneration into the Tenth Doctor (David Tennant)