'Doctor Who' has been plenty generous in recent weeks with a new 50th anniversary trailer for "The Day of the Doctor," as well as photos and an inside treat of the series' history in surprise cameo minisode "The Night of the Doctor." That said, now we can go back further into 'Doctor Who' genesis with the trailer for series' origin movie 'An Adventure in Space and Time'!

Airing on November 22 before the big global simulcast of the 'Doctor Who' 50th Anniversary special on the 23rd, ‘Sherlock‘ star Mark Gatiss’ ‘Doctor Who’ origins movie, ‘An Adventure in Space and Time,' features 'Game of Thrones' star David Bradley in the role of William Hartnell, the first actor to portray the iconic 'Doctor Who' at the outset of the series.

Brian Cox will also appear in the film as BBC Head of Drama Sydney Newman, with Jessica Raine as ‘Doctor Who’ producer Verity Lambert, for a production directed by Terry McDonough (‘Breaking Bad‘). Says The BBC of the upcoming special:

This special one-off drama travels back in time to 1963 to see how the beloved Doctor Who was first brought to the screen.

Actor William Hartnell felt trapped by a succession of hard-man roles. Wannabe producer Verity Lambert was frustrated by the TV industry’s glass ceiling. Both of them were to find unlikely hope and unexpected challenges in the form of a Saturday tea-time drama, time travel and monsters!

Allied with a team of brilliant people, they went on to create the longest-running science fiction series ever, now celebrating its 50th anniversary.

Are you ready to go back in time to see how 'Doctor Who' began? Check out the trailer for 'An Adventure in Space and Time' above, and tell us what you hope to see around the upcoming 50th anniversary!