Third Doctor 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 wily but less action-oriented predecessors. While previous
The Doctor (Doctor Who) of a previous incarnation sustaining mortal injury, though he can regenerate from old age and was once forced to regenerate by the Time Lords. A common side effect the Doctor frequently experiences is a period of instability and partial amnesia following regeneration. Some post-regeneration experiences have been more difficult than others. In particular, the Fifth Doctor began reverting to his previous personalities and required the healing powers of the TARDIS's "Zero Room" to recuperate ("Castrovalva"). The Sixth Doctor experienced extreme paranoia and flew into a murderous rage, nearly killing his companion ("The Twin Dilemma"). The Eighth Doctor experienced amnesia due