David Knight (Christopher March), Gene Anderson (Brenda Carpenter), Kevin Brennan (Alexis Brant), Ian Ainsley (Police Constable), Hilary Bains (Policewoman), Donald Bradley (Man with bike), Ernest Butcher (Grimes), Patrick Desmond (Police doctor), Alan Hayward (Uniformed Constable), Gladys Henson (Mrs Megett), Sam Kydd (Cycle dealer), Stephen MacDonald (Plainclothes man), Stephen Rich (Page boy), June Rodney (Maria Rosetti), Frank Sieman (Poppa Rosetti), John Simpson (Fingerprint man), Ewen Solon (Det. Insp. Fenner)