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.
David Tennant
"Doctor Who" returned to British screens in 2005, with Christopher Eccleston playing the role of the Ninth Doctor in the first series. Tennant replaced him as of the second series, making his first, brief appearance as the Tenth Doctor in the episode "The Parting of the Ways" (2005) at the end of the regeneration scene, and also appeared in a special shown as part of the 2005 Children in Need appeal, broadcast on 18 November 2005. He began filming the new series of "Doctor Who" in late July 2005. His first full-length outing as the Doctor was a 60-minute special, "The Christmas Invasion", first broadcast on Christmas Day 2005. Tennant had been formally offered the role of the Doctor during rehearsals for "The Quatermass Experiment". Although the casting was not officially announced until later in April, both castmates and crew became aware of the speculation surrounding Tennant; in the live broadcast Jason Flemyng (Quatermass) changed his first line to Tennant's Dr Briscoe from "Good to have you back, Gordon" to "Good to have you back, "Doctor"" as a deliberate reference.