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.
John Simm
In 2007, Simm was chosen by Russell T. Davies to play The Master, the nemesis of The Doctor in the long-running BBC series "Doctor Who". He appeared in the final three episodes of series three: "Utopia", "The Sound of Drums", and "Last of the Time Lords". When originally cast in the third series of Doctor Who, it was announced that he would be playing a character by the name of Mr Saxon, a name that was later revealed as an alias of the character he was portraying. He reprised the role in the 2009 two-part special "The End of Time". In 2008, Simm played Edward Sexby in "The Devil's Whore", a four-part English Civil War epic for Channel 4. He performed at the Royal Variety Performance with Alexander Armstrong and Ben Miller, and starred in the film "Skellig", broadcast on Sky1 in April 2009.