Stephen
Peter Reynolds
Claire
Rona Anderson
Bruno
Martin Benson
Policeman (uncredited)
Stephen Boyd
Robert
Patrick Barr
Marion
Lana Morris
Stella
Genine Graham
Joe
Michael Balfour
Wally
John Forrest
Mrs. Barclay
Viola Lyel
Prof. Barclay
Martin Walker
Inspector
John Le Mesurier
Director
Ken Hughes
Story
Music
Carlo Rustichelli
Writer
Pietro Germi
Producer
Roger Proudlock
Editor
Sam Simmonds
Director of Photography
Gerald Gibbs
Art Direction
Don Chaffey