Stanley Baker
— Detective Inspector Jamieson
Denis Lill
— Sgt. Beck
David Swift
— Insp. Havelock
Derek Francis
— Octavius Lamb
Barbara Leigh-Hunt
— Madeleine
Simon Fisher-Turner
— Steven (as Simon Turner)
Peter Sallis
— Lloyd
Artro Morris
— Mr. Humber
Gillian Raine
— Miss Bennett
Michael Hawkins
— Bardon
Ingrid Hafner
— Mary
Bruce Boa
— Professor Friedland
Cyril Shaps
— Mr. Lavender
Shelagh Wilcocks
— Mrs. Lavender
Honora Burke
— Mrs. Bute
John Challis
— Casson
Anthony Roye
— Doctor Robson
Eve Karpf
— Miss Compton
Anthony Bailey
— Sgt. Latimer
Miles Anderson
— P.C. Hanworth
Dennis Blanch
— P.C. York
Cheryl Hall
— Amy
Colin Edwynn
— Michael
Mona Hammond
— Nurse
Melinda Sheridan
— Receptionist