Eric Pohlmann
Commissionner Aristide Goron / Goron / The Emir

Boris Karloff
Colonel March Of Scotland Yard

Ewan Roberts
Inspector Ames

Marne Maitland
Thoreau / Waiter

Phil Brown
Dr. Bryan Hayes / Gordon

Anton Diffring
Francois / Davos

Patrick Barr
Horton

Russell Waters
Hocksby

Alan Wheatley
O'Brien

Olaf Pooley
Carlmeddy

Hubert Gregg
Pennacott

Rosalie Crutchley
Annette

Richard O'Sullivan
Roger

Eliot Makeham
1st Judge

Mary Clare
Mrs. Wrigley

Zena Marshall
Madeleine

Patricia Owens
Betty Hartley

George Coulouris
Harwood

John Hewer
John Parrish

Elspet Gray
Johanna