- Richard Conte
- Bill Locklin
- Rona Anderson
- Julia McCullum
- Russell Napier
- Superintendent Harrington
- John Horsley
- Sergeant Gibson
- Noel Johnson
- Det. Sergeant Hawkins
- Colin Gordon
- Harry of the ''Echo''
- Donald Bisset
- Editor of the ''Echo''
- Arnold Marlé
- Dushenko
- Sylva Langova
- Hilde
- Jane Welsh
- Mrs. McCullum
- Colin Tapley
- Sir Clive Raglan
- Bernard Rebel
- Vinsen
- Jessica Kearns
- B.O.A.C. Woman Officer
- Theodore Wilhelm
- Club Secretary
- Guy Deghy
- Sports Organiser
- Wilfred Boyle
- Halliard
- Peter Godsell
- Tommy
- Leonard Frank
- Pepé - the dwarf
- Tony Sympson
- Taxi Driver
- Geoffrey Denys
- Doctor
- Jon Farrell
- U.S.A. Newsreader
- George Margo
- U.S. Sailor
- Ed Devereaux
- U.S. Sailor
- Frank Littlewood
- Inspector May
- André Mikhelson
- Soviet Commandant
- John King-Kelly
- Andor
- Edwin Brown
- PC Green
- Aimée Delamain
- Mrs. Henley (Dr Barnes's Housekeeper)
- John Fabian
- Fingerprint Man
- Charles Hammond
- Reporter at Press Briefing
- Humphrey Heathcote
- Special Branch Commander Lovatt
- Alastair Hunter
- First reporter
- Gareth Jones
- Russian Sentry
- Michael Kelly
- Police Constable
- Cyril Kent
- Santatorium Attendant
- Robert O'Neil
- Second reporter
- Joe Wadham
- Man Helping Dushenko Escape
- Roger Williams
- Dr. Clement Barnes
