The Doctor (Doctor Who)
Jodie Whittaker took over the role as the Thirteenth Doctor in the 2017 Christmas special. In addition to the above-listed actors, others have played versions of the Doctor for the duration of particular storylines.
Notably, John Hurt guest starred as the War Doctor in the closing moments of the 2013 episode "The Name of the Doctor", the webcast "The Night of the Doctor" and the 50th Anniversary episode "The Day of the Doctor". The War Doctor is an incarnation existing between those of McGann and Eccleston. Hurt was never the programme's lead actor; his Doctor was retroactively inserted into continuity for the programme's 50th anniversary, and was written so as not to disturb the ordinal naming of the established Ninth, Tenth and Eleventh Doctors. In the 1986 serial "The Trial of a Time Lord", Michael Jayston played the Valeyard, an amalgamation of the Doctor's darker sides from between his twelfth and final incarnations.
Doctor Who (series 10)
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 Doctor's newest travelling companion, and also features Matt Lucas as Nardole, who appeared in the 2015 and 2016 Christmas specials. Michelle Gomez and John Simm return as their respective incarnations of the Master. The main story arc for the first half of the series revolved around the Doctor and Nardole occupying themselves as a university professor and assistant while they guard an underground vault containing Missy, who the Doctor has sworn to protect for a thousand years after her supposed execution. Missy later travels with the team in the TARDIS, and eventually partners with her previous incarnation as they all battle a Cyberman onslaught aboard a Mondasian colony ship.