O is the Master?! | Spyfall: Part One | Doctor Who

Amongst the Doctor’s friends is a deadly double agent - one that she knows all too well. Subscribe to Doctor Who for more exclusive videos: WATCH MORE: Series 12: The Thirteenth Doctor: The Master: MORE ABOUT DOCTOR WHO: Welcome to the Doctor Who Channel! Travel in the TARDIS with clips dating back to the Doctor’s first incarnation in 1963, all the way through dozens of regenerations. Including behind-the-scenes footage, exclusive videos and our very own show Doctor Who: The Fan Show - this is the place to find all the best official clips. #DoctorWho This is a commercial channel from BBC Studios. Service information and feedback: