Louis Jourdan
— Duke Philippe de Beauvais
Belinda Lee
— Virginia Traill
Keith Michell
— Colonel St. Gerard
Richard O'Sullivan
— Louis XVII / Richard de Beauvais
Martita Hunt
— Lady Lydia Fell
Finlay Currie
— Mr. Patient
Anne Heywood
— Glynis
Brian Rawlinson
— Dylan Evans
Terence Longdon
— Sir Frederick Venner
Frederick Leister
— Capt. Andrew Ogden
Austin Trevor
— Mr. Petitval
Laurence Payne
— Lautrec
Jacques Brunius
— De Chassagne
John Dearth
— Simon the Jailer