Game of Thrones alum David Bradley will reprise the role of the First Doctor for Peter Capaldi’s swan song during this year’s upcoming Doctor Who Christmas special.

To be precise: Bradley actually played the role of William Hartnell, the actor who originated the role of the beloved Time Lord, on the BBC’s 50th anniversary must-see documentary drama An Adventure in Space and Time. What this really means is the man who portrayed the role of William Hartnell who played the First Doctor will … officially play the First Doctor!

According to The Mirror (which means take the news with a grain of salt) Bradley will guest-star in the yuletide special alongside Capaldi following the departure of Pearl Mackie as new companion Bill Potts (this is as-of-yet unconfirmed) at the end of Season 10.

The Christmas special will see the First Doctor alongside the 12th Doctor, as the duo must work together to save their home planet of Gallifrey by moving it to another dimension, which will be Capaldi’s final hurrah as the Time Lord, since he's set to regenerate into the 13th Doctor. Remember in the 50th special “The Day of the Doctor” where we had our first glimpse of Capaldi (most specifically his eyes)? Yep, looks like we’ll finally get to see how that scene played out from the 12th Doctor’s point of view!

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Here's what an inside source told The Mirror about Bradley coming on board the TARDIS: “David was convincing as Hartnell, it’s exciting he’s back. Four years ago it took all the previous Doctors to save Gallifrey, so maybe some of the others will also pop up in Capaldi’s swansong. It’s great that the 1st Doctor will be there to help out during those all-important regeneration moments.”

What do you guys think? Are you looking forward to the First Doctor’s return on Doctor Who?

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(via The Mirror)