Dr. Schuler
Anton Diffring
Elissa Caro
Erika Remberg
Evelyn Morley
Colette Wilde
Dr. Morley
William Mervyn
Inspector Knopf
Peter Swanwick
Nicole (as a Child)
Carla Challoner
Dwarf
Kenny Baker
Baron Von Gruber
Walter Gotell
First Roustabout
Kenneth J. Warren
Chief Eagle Eye
Jack Carson
Carnival Barker (uncredited)
Glyn Houston
Roustabout (uncredited)
Reg Thomason
Nicole Vanet
Yvonne Monlaur
Circus Audience Member (uncredited)
Arthur Dibbs
Vanet
Donald Pleasence
Angela
Jane Hylton
Martin
Kenneth Griffith
Inspector Arthur Ames
Conrad Phillips
Supt. Andrews
Jack Gwillim
Magda von Meck
Vanda Hudson
Melina
Yvonne Romain
Director
Sidney Hayers
Editor
Director of Photography
Douglas Slocombe
Producer
Samuel Z. Arkoff
Screenplay
George Baxt
Leslie Parkyn
Julian Wintle
Reginald Mills
Associate Producer
Norman Priggen
Original Music Composer
Muir Mathieson
Franz Reizenstein
Art Direction
Jack Shampan
Makeup Artist
Trevor Crole-Rees
Hairstylist
Maude Onslow
Sound Editor
Lionel Selwyn
Sound Recordist
Len Page
Ken Cameron
Costume Design
Morris Angel
Wardrobe Master
Vi Murray
Assistant Editor
Harry Ledger
Production Manager
Charles Permane