And to make it even more special, it sees him team up with the very first Doctor, who will be played by David Bradley (Harry Potter, The Strain). Bradley was cast partly because he actually played William Hartnell in An Adventure in Space and Time, a 50th anniversary BBC TV movie from 2013 about the behind-the-scenes of the creation of Doctor Who and the production of the first four seasons. But for a Doctor Who fan, the ideal Christmas is gorging on as many episodes of the sci-fi series as humanly possible without the aid of a TARDIS.
Both will be handing over the reins of their respective jobs with "Twice Upon a Time", the episode that will see the Doctor regenerate into Jodie Whittaker's take on the character. Watch that new trailer, above. The return of the Doctor's most recent companion hasn't been treated as a secret, but this trailer is the best look at Bill's role so far.
However, this will not be the last "Doctor Who" stint for Capaldi. It will also highlight the show's writer Steven Moffat as he reflects on his time with DOCTOR WHO, as reported by Deadline. Narrated by actor Colin McFarlane (The Dark Knight, Doctor Who), the episode, featuring archive footage and interviews, looks back at Peter Capaldi's era as the Twelfth Doctor - from his very first script read through to his very last.
David Tennant's proper debut (apart from his regeneration scene) was made in "The Christmas Invasion", Matt Smith first appeared in "The End of Time", and Peter Capaldi first appeared in "The Time of the Doctor", Christmas specials all. According to reports, BBC and BBC America will air another special episode sometime after Christmas that will be titled "Doctor Who: Farewell to Peter Capaldi".
"Doctor Who: Twice Upon A Time" will air on Christmas Day, Dec. 25, at 9 p.m. EST on BBC America.