Spyfall

TV Series 12 episode 1

Aired: 1-5 January 2020

The first TV appearance of this new Master. He's using the identity of an MI-6 operative called "O," which is why he's the "Spy Master." It's an absolutely brilliant reveal, one that John Simm should have had. However, once he's revealed, this Master acts just as unhinged as the previous few.