| Name | Character | Episodes |
|---|---|---|
| Phil Dunster | Mike Stephens | 11 |
| Peter Capaldi | Gideon Shepherd | 11 |
| Jessica Raine | Lucy Chambers | 11 |
| Nikesh Patel | DI Ravi Dhillon | 11 |
| Alex Ferns | DS Nick Holness | 6 |
| Thomas Dominique | Lee Warren | 5 |
| Barbara Marten | Sylvia | 3 |
| Meera Syal | Dr Ruby Bennett | 3 |
| Ramanique Ahluwalia | PC Beth Courtney | 3 |
| Meera Syal | Dr. Ruby Bennett | 2 |
| Caroline O'Neill | Paula Slade | 2 |
| Kim Allan | Young Sylvia | 2 |
| Jane McCarry | Bella Holness | 2 |
| Tom Ashley | Sergeant Dorse | 2 |
| Sandra Huggett | Karen Mulligan | 2 |
| Sidney Livingstone | Gerald Bell | 1 |
| Stephen Ashfield | Lawrence | 1 |
| Alexa Goodall | Evelyn Wiseman | 1 |
| Mark Cox | Malcolm Shepherd | 1 |
| Patrick Regis | DCI Thomas Hatby | 1 |