 | Marius Goring plays Prof. John Hardy | | Ann Morrish plays Dr. Jo Hardy |
| Victor Winding plays Det. Chief Insp. Fleming | | Michael Farnsworth plays Det. Sgt. Ashe |
 | Jeremy Sinden plays Price | | Virginia Stride plays Susan Bartlett |
| Sally Nesbitt plays Jane Carter | | Valerie Murray plays Sandra Hughes |
| William Ellis plays Trevor Salter | | William Lucas plays Michael Capper |
 | Warren Clarke plays Det. Insp. Robbins | | Veronica Strong plays Jean Buckley |
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