Spyfall, Part 1

"Spyfall" is the two-part premiere of the twelfth series of the British science fiction television programme Doctor Who, first broadcast on BBC One on 1 January 2020, and concluded on 5 January 2020. It was written by showrunner and executive producer Chris Chibnall. The first episode was directed by Jamie Magnus Stone, and the second by Lee Haven Jones.

In the episodes, the Thirteenth Doctor (Jodie Whittaker) and her companions Graham O'Brien (Bradley Walsh), Ryan Sinclair (Tosin Cole), and Yasmin Khan (Mandip Gill) are enlisted by MI6 to investigate a former agent and an alien threat. The episodes mark the first return of the Master since "The Doctor Falls" (2017), and also see the return of Gallifrey, the Doctor's home planet.

The two episodes were watched by 6.89 and 6.07 million viewers respectively, and received generally positive reviews from critics. Part One is also dedicated to former script editor Terrance Dicks, who had died in 2019.