Second Doctor
The Second Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television series "Doctor Who". He was portrayed by character actor Patrick Troughton.
David Bradley (English actor)
In 2017, in the final episode of the tenth series of "Doctor Who", "The Doctor Falls", Bradley returned to portray the First Doctor, having previously been portrayed by Hartnell, who originally played the character. He reprised this role in the 2017 Christmas special, "Twice Upon a Time". This makes him the third actor to play the role in the television programme, after William Hartnell and Richard Hurndall since the premiere of "Doctor Who" in 1963, and at the age of 75, he is the also the oldest actor to play the role of the Doctor.