Christopher Lee as Gregor

Leo Genn as Elliott

Anthony Newlands as Barberini

Heinz Drache as Carl

Eddi Arent as Eddie

Klaus Kinski as Manfred

Margaret Lee as Gina

Suzy Kendall as Natasha

Cecil Parker as Sir John

Victor Maddern as Mason

Maurice Kaufmann as Mario

Lawrence James as Manley

Tom Bowman as Jackson

Skip Martin as Mr. Big

Nosher Powell as Red

Gordon Petrie as Negro

Henry B. Longhurst as Porter

Dennis Blakely as Guard (1) Armoured Van

George Fisher as Fourth Man

Peter Brace as Man in Speedboat

Roy Scammell as Man in Speedboat

Jeff Silk as Security Man

Keith Peacock as Security Man