Twelfth Doctor

The Twelfth Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is portrayed by Scottish actor Peter Capaldi in three series as well as four specials. As with previous incarnations of the Doctor, the character has also appeared in other Doctor Who spin-offs, both during and after the character's televised appearances. The Doctor is an extraterrestrial being from a humanoid species known as Time Lords from the planet Gallifrey. The Doctor travels through space and time using a time travelling spaceship called the TARDIS and frequently travels with companions. When a Time Lord is fatally injured or weakened by old age, their cells regenerate into a new body, while they retain their memories, their personality changes. The different portrayals of the Doctor function as distinct stages within a single, continuous narrative. Capaldi's portrayal of the Doctor is initially a spiky, brusque, contemplative, and pragmatic character who conceals his emotions in the course of making tough and sometimes ruthless decisions. Very quickly, however, he becomes extremely humanitarian and compassionate, and more openly showcases his selflessness. Preceded in regeneration by the Eleventh Doctor, he is followed by the Thirteenth Doctor. This incarnation's companions include school teacher Clara Oswald, who also travelled with his previous incarnation, for his first two series; and for his final series, university canteen assistant Bill Potts and humanoid cyborg Nardole. He also made a guest appearance in the Doctor Who spin-off series Class, appearing in the show's first episode.