Mr. Rogan
Dr. Marko
Lord Warrick
Mr. Brigstock
British Secretary
Frederick Malone
Chief Inspector W.R. Allison
(uncredited)
Sir Robert Bentley
Leuwen Grayle
Charles Seagrave
Giles Conover
Judge Brisson
Major Loring (uncredited)
Businessman (uncredited)
Sir Frederick Fleet
Pleyel
Colonel Fitzhume (uncredited)
Col. Herman Fournier
Weatherby (uncredited)
Paul Panois
Kilpatrick
James V. Thorne
Floyd Kirsten
Dr. Leonard V. Meecham
German Agent on Radio (voice) (uncredited)
Major
Portmaster
Dr. Kurt Immelman
Major Cunningham
Dr. Wilton
Professor Langer
Dr. Lockberg
Doctor (uncredited)
Lord Keith
Tom Armitage
Roger Smythe
Lieut. Strope
Dr. Rankin
Homer
Sir Malcolm Drake (uncredited)
Deacon Arnold Foster
Mr. Charles Pryor
Attorney General (uncredited)
King Henry VI
Sir John Gresham
Horace Granville
Lockwood
Lord Wickham
Cardinal Richelieu
Benjamin Disraeli
Fred Thomas
Ebenezer Balfour
The Sparkler
James Stratton
Corey
Jukes
King Louis XIII
Garry Ames
Feize
Harley Travers
Captain Auguste Lutte
Wriothesley
Capt. Ronald Dancy, DSO
Harry Tresham
Ambatriadi
Claude Holford
Gordon Druce
Raymond Carteret
Sir Hugo Boycott
Capt. Gardner
Armand de Marny
Rollo Stevens
Levett
Sir Neville Moreton
