Yul Brynner as Dan Slater / Kalmar

Britt Ekland as Gina

Clive Revill as Frank Wheatley

Anton Diffring as Col. Berthold

Moira Lister as Mrs. Carrington

Lloyd Nolan as Edwards

George Mikell as Max Gruner

Brandon Brady as Gregori

Julia Arnall as Anna Wheatley

David Bauer as Andrew Miller

Ronald Radd as Russian General

Kenneth J. Warren as Police Chief

David Healy as Halstead

Carl Jaffe as Police Surgeon

Douglas Muir as Wilfred

Frederick Schiller as Ticket Seller

Ernst Walder as Frischauer