Bette Davis as Madame Sin

Robert Wagner as Anthony Lawrence

Denholm Elliott as Malcolm De Vere

Gordon Jackson as Commander Cavendish

Dudley Sutton as Monk

Catherine Schell as Barbara

Paul Maxwell as Connors

David Healy as Braden

Alan Dobie as White

Al Mancini as Fisherman

Paul Young as Naval Driver

Roy Kinnear as Holidaymaker

Charles Lloyd Pack as Mr. Willoughby

Burt Kwouk as Scarred Operator