- Peter Cushing - Judge Gautier
- Walter Gotell - Boucher
- Robert Henderson - Henry Davis
- Betty Lynne - Mrs. Darbot
- Derek Martin - Gallery Guard
- Gordon Tanner - Harry Crane
- Harry Fielder - Supporting Artist (uncredited)
- Aileen Lewis - Diner at Negresco (uncredited)
- Guy Standeven - Negresco Receptionist (uncredited)
- Roy Boyd - Michel
- Clinton Greyn - Anthony Martin
- Aharon Ipalé - Paul
- Perry Morris - Herbault
- Louis Negin - Claude
- Ingrid Pitt - Lyn Martin
- Alex Scott - Jean
- Max Faulkner - Servant (uncredited)
- Earl Cameron - Jombote
- Walter Henry - Consulate Official (uncredited)
- Edward Cast - Major
- Kieron Moore - Jacques Picard
- Leonard Trolley - Ferrand
- Bert Batt
- Phyllis Townshend
- Andy Armstrong
- Paul Gallico
- Herbert Hirschman
- Veronica Barnes
- John Pellatt
- Weston Drury Jr.
- Peter Lennard
- Ken Thorne
- Ted Karnon
- David Bowen
Peter Cushing hace el papel de Judge Gautier.
Earl Cameron interpreta a Jombote en la serie.
Brian Keith interpreta a Stephen "The Fox" Halliday en la serie.
John Mills hace el papel de Thomas "The Elephant" Devon.
Lilli Palmer hace el papel de Manouche "The Leopard" Roget.
Barry Morse interpreta a Alec "The Tiger" Marlowe en la serie.
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