| Name | Character | Episodes |
|---|---|---|
| Derren Nesbitt | Jordan | 27 |
| Wensley Pithey | Det. Supt. Eden | 27 |
| Patrick Mower | Tom Haggarty | 26 |
| Paul Eddington | Strand | 26 |
| George Sewell | Det Ch Supt Alan Craven | 26 |
| Morris Perry | Charles Moxon | 13 |
| Stephen Greif | 2 | |
| Geoffrey Bayldon | 1 | |
| Fulton Mackay | 1 | |
| Richard Marner | 1 | |
| Terence Bayler | 1 | |
| Roger Lloyd Pack | 1 | |
| Cheryl Hall | 1 | |
| Gareth Thomas | 1 | |
| Leslie Schofield | 1 | |
| Michael Sheard | 1 | |
| George Pravda | 1 | |
| Barry Jackson | Sergeant Workman | 1 |
| André Morell | 1 | |
| Bernard Archard | 1 | |
| Tony Beckley | 1 | |
| Ronald Leigh-Hunt | 1 | |
| Tony Selby | Ridley | 1 |
| Arnold Diamond | 1 | |
| Hamilton Dyce | 1 | |
| Norman Jones | 1 | |
| Gillian Hawser | Beryl | 1 |
| Michael Culver | 1 | |
| Paul Shelley | 1 | |
| Morris Perry | 1 | |
| Richard Butler | Commander Nicols | 1 |
| Olaf Pooley | 1 | |
| Jack Carr | Det. Sgt. Cutler | 1 |
| Jonathan Adams | 1 | |
| Peter Jeffrey | Chief Supt Pettiford | 1 |
| Georgina Hale | 1 | |
| Windsor Davies | 1 |