Anton Diffring
Dr. Schuler
Erika Remberg
Elissa Caro
Yvonne Monlaur
Nicole Vanet
Donald Pleasence
Vanet
Jane Hylton
Angela
Kenneth Griffith
Martin
Conrad Phillips
Inspector Arthur Ames
Jack Gwillim
Supt. Andrews
Vanda Hudson
Magda von Meck
Yvonne Romain
Melina
Colette Wilde
Evelyn Morley
William Mervyn
Dr. Morley
Peter Swanwick
Inspector Knopf
Carla Challoner
Nicole (as a Child)
Kenny Baker
Dwarf
Walter Gotell
Baron Von Gruber
Kenneth J. Warren
First Roustabout
Jack Carson
Chief Eagle Eye
Glyn Houston
Carnival Barker (uncredited)
Reg Thomason
Roustabout (uncredited)
Arthur Dibbs
Circus Audience Member (uncredited)