Tom Miller Creator, Executive Producer Sam Myer Creator, Executive Producer Stephen Graham DI Roy Carver Actor Daniel Mays DI John Major Actor Anna Maxwell Martin Kelly Major Actor Rosie Cavaliero DCS Dennett Actor Steve Oram Gilbert Actor Michelle Greenidge Officer Not Judy Actor Amanda Payton Dr. Alison Parfit Actor Richard Gadd Liam Cleasby Actor Anna Leong Brophy Voice of A.I. (voice) Actor Emily Lloyd-Saini Ryle Actor Montel Douglas Supplier Actor Dave Shelley Priest Actor Simon Strutt Special Detective Actor Faith Edwards Civil Servant Actor Katarina Martin Detective Actor Obie Matthew Detective Actor Phil Temple Executive Producer Diederick Santer Executive Producer Morwenna Gordon Executive Producer Al Campbell Director