| Name | Character | Episodes |
|---|---|---|
| Nicola Walker | Susan Taylor | 16 |
| Shaun Dingwall | Mark Rivers | 16 |
| Robson Green | Dave Creegan | 16 |
| Michael Feast | Commander Enwright | 16 |
| Adam Kotz | Jonathan Kreitman | 6 |
| Andrew Scarborough | Martin Simmons | 4 |
| Jasper Jacob | German DCI | 1 |
| Des McAleer | DCI Frank Dolland | 1 |
| Sean Gilder | Steve Carroll | 1 |
| Kenneth MacDonald | Cyril | 1 |
| Bernard Gallagher | Chief Supt Beecham | 1 |