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.
Doctor Who: The First Doctor Adventures
The First Doctor Adventures is a Big Finish Productions audio play series based on the British television programme "Doctor Who". It sees the return of David Bradley as the First Doctor, a role originated by William Hartnell from 1963 to 1966, as well as by Bradley on television in the episodes "The Doctor Falls" and "Twice Upon a Time". David Bradley also portrayed William Hartnell in the BBC bio-drama, "An Adventure in Space and Time".