David Mendelssohn
Dr. Robert Cook
Cornelius A. Woaegen
Benson Thacker
French-Canadian Radio Speaker (voice) (uncredited)
Harvey Wood
Dr. Jekyll & Mr. Hyde (uncredited)
Prince Andrei Bolkonsky
Professor Carter
Robert Cohn
Maj. Gen. Robert Haines
Noel, Marquis de Maynes
Rudy DeMeyer
Mel Fields
Radcliffe (US version)
Frenchy Fairmont
Georges Gauthier
Paul Berthalet
Gabriel 'Gobby' Broome
Professor Henry Douglas
Juan Bautista de La Salle
King Eurich
Cleander
Joshua
Police superintendent
Arthur
Stephen Orlac
Vera's husband
Le comte Henri de Chevincourt
Philip Allan
Self (archive footage)
Dr. Walker
District Attorney Mannino
Leopoldo De Karnstein
Massimo Oderisi
Van Gould
Henrik
Roberto Micheli
Scott Mason Carter
Aurelio Morelli
Marco
Crown Prince Rudolph
Giancarlo Barandero
Capt. Alfred Westerman
David
El Greco (Domenico Teotocopulo)
Don Paolo Salinas
Dalton Harvey
Maj. Foster MacLain
Peseti
CIA Chief Frankenheimer
Self - Actor / 1st Husband (archive footage)
Sheriff
Arthur Orloff
Self
Andrea Di Tula
Colonel Stone
Doctor Harrison
Father Serra (uncredited)
Patriarch
Dr. Sidney Coleman
Stephan Mathiesen
Self (archive footage) (uncredited)
Dr. Sanford
Gen. Franz von Clodius
Luís Bello
Andreas Heggener
Anthony Durano
Judge Michael Lengel
Carl Charnock
General Murchison
Franz Bollenstein
Jerry Parks
Phillip Erickson
Eric Brahm
Father Neill
Fritz Gerlich
Harrison Page
Frederick
Dr. Paolo Brogli
Armando Della Morra
Nicholas Skinner
Emil Radick
George Matthews
himself
Miles Austin
Self - Panelist