David Bradley, best known as Hogwarts caretaker Argus Filch, has been pegged to play the first Doctor, William Hartnell in BBC Two's story of "Doctor Who" "An Adventure in Space and Time".
According to BBC:
‘An Adventure in Space and Time' will tell the story of the genesis of Doctor Who - first aired on 23 November 1963 - and the many personalities involved. The BBC’s Head of Drama Sydney Newman, credited with the creation of the show, will be portrayed by Brian Cox (The Bourne Supremacy, The Bourne Identity) and the producer, Verity Lambert, by ‘Call the Midwife’ star Jessica Raine. The director of the first ever episode, ‘An Unearthly Child’, Waris Hussein, will be played by Sacha Dhawan (History Boys, Last Tango In Halifax).
"An Adventure in Space and Time" is written by "Who" writer Mark Gatiss and executive produced by Steven Moffat, Caroline Skinner, and Gatiss.
Filming begins in February and will air as part of BBC's "Doctor Who" 50th Anniversary special.