The Doctor (Doctor Who) footage. Tom Baker did reappear, but as "the Curator", an ambiguously different character who he was not credited for playing. A voice actor, John Guilor, recorded a line of audio impersonating the First Doctor, for which he was credited as "Voice Over Artist". In other multi-Doctor stories, the multiple actors are all credited as "The Doctor", the exception being "The Three Doctors" (1972–73), which credited William Hartnell, Patrick Troughton and Jon Pertwee as "Doctor Who" as the 1972 serial preceded the practice of crediting the character as "The Doctor". In "Human Nature" (2007), the plot involves the Tenth Doctor altering
William Russell (actor) of the programme's fiftieth anniversary celebrations. Russell appeared as a character in the drama, portrayed by actor Jamie Glover. Russell also had a cameo role in "An Adventure in Space and Time" playing a BBC Commissionaire (security guard) named Harry. The same year, Russell portrayed both Ian and the First Doctor in the Big Finish audio play "The Light at the End", produced to celebrate the 50th anniversary of "Doctor Who". On 2 December 1988, Russell and his second wife, Etheline Margareth Lewis , had their first child Alfred Enoch, when he was 64 years old. Alfred is now an