| Name | Character | Episodes |
|---|---|---|
| Stanley Tucci | Jefferson Grieff | 4 |
| David Tennant | Harry Watling | 4 |
| Dylan Baker | Warden Casey | 4 |
| Lyndsey Marshal | Mary Watling | 4 |
| Dolly Wells | Janice Fife | 4 |
| Lydia West | Beth Davenport | 4 |
| Atkins Estimond | Dillon Kempton | 4 |
| Kate Dickie | Morag | 2 |
| Tilly Vosburgh | Hilda | 2 |
| Alan Williams | Gordon | 1 |
| Tim Berrington | William | 1 |
| Simon Delaney | Claude Kreiner | 1 |
| Nancy Crane | Hannah | 1 |
| Patrick Toomey | Connor Doyle | 1 |
| Franc Ashman | DI Grover | 1 |
| Malek Alkoni | Faisel | 1 |
| Daniel Kendrick | Victor | 1 |
| Cokey Falkow | Barney | 1 |