| Name | Character | Episodes |
|---|---|---|
| Martin Shaw | Chief Constable Alan Cade | 35 |
| Frederick Jaeger | 35 | |
| Tim Pigott-Smith | 35 | |
| Michael Cochrane | 35 | |
| Tony Caunter | 35 | |
| Ross Kemp | 35 | |
| Judy Loe | 35 | |
| Michael Haughey | Chief Supt. Pettit | 2 |
| David Forman | Cheng Rui | 1 |
| Robert Demeger | Supt. Wilkins | 1 |
| Bruce Myers | Pietro Donati | 1 |
| Charlotte Chatton | Frankie | 1 |
| Robin Weaver | Camilla | 1 |
| William McBain | John Reid | 1 |
| Jude Alderson | Jane | 1 |
| Jeremy Bulloch | Jack Bertrand | 1 |
| Paul Stacey | Eco Warrior | 1 |
| Simon Cook | Chief Insp. Ian Maidment | 1 |
| Frank Baker | Dennis | 1 |
| Steven Mackintosh | Dean Mills | 1 |