The Twelfth Doctor is an incarnation of the Doctor, the protagonist of the BBC 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. Capaldi's portrayal of the Twelfth Doctor has been met with praise.
|The Twelfth Doctor|
|Doctor Who character|
|First regular appearance||"Deep Breath" (2014)|
|Last regular appearance||"Twice Upon a Time" (2017)|
|Introduced by||Steven Moffat|
|Portrayed by||Peter Capaldi|
|Preceded by||Matt Smith|
|Succeeded by||Jodie Whittaker|
|Tenure||23 August 2014 – 25 December 2017|
|No of series||3|
|Appearances||35 stories (40 episodes)|
|Previous version||Eleventh Doctor|
|Next version||Thirteenth Doctor|
Within the series' narrative, the Doctor is a millennia-old alien Time Lord from the planet Gallifrey who travels in time and space in the TARDIS, frequently with companions. At the end of life, the Doctor regenerates; as a result, the physical appearance and personality of the Doctor changes. Capaldi's portrayal of the Doctor is a spiky, brusque, contemplative, and pragmatic character who conceals his emotions in the course of making tough and sometimes ruthless decisions. Over time, he becomes kinder, compassionate, and more openly showcases his selflessness.
This incarnation's companions include school teacher Clara Oswald (Jenna Coleman), who had travelled with his previous incarnation, canteen assistant and student Bill Potts (Pearl Mackie) and alien Nardole (Matt Lucas). He also made a guest appearance in the Doctor Who spin-off series Class, appearing in the show's first episode.