Guest Stars Philippa Urquhart as Susan Pete Postlethwaite as Jack Frost Oliver Ford Davies as Dept. Assist. Commissioner Gradley Tommy Wright as Straub Terence Budd as P.C. Lyall Patrick Moore as Garfield Jill Simcox as Miss Russell Ian Brimble as Reg Grey Carole Bollard as W.P.C. Wilkins Stephen Lawrence as Det. Sgt. Hunt Judith Bruce as Babs Raymond Brody as Franco John Golightly as Det. Insp. Howitt David Gillies as P.C. Thomas Jean Leppard as Jean Grey Mike Savage as Sgt. Hissink Uncredited Norman Hartley as Commissionaire
