Holliday Grainger DI Rachel Carey Actor Paapa Essiedu Isaac Turner Actor Ben Miles Commander Danny Hart Actor Lia Williams DSU Gemma Garland Actor Charlie Murphy Simone Turner Actor Nigel Lindsay Tom Kendricks Actor Andy Nyman Rowan Gill Actor Indira Varma Khadija Khan Actor Ron Perlman Frank Napier Actor Ben Chanan Writer, Executive Producer Philippa Langdale Director Kristian Dench Producer David Heyman Executive Producer Rosie Alison Executive Producer Derek Ritchie Executive Producer Tom Coan Executive Producer Tom Winchester Executive Producer