Mr. Rogan

Dr. Marko

Lord Warrick

Mr. Brigstock

British Secretary

Frederick Malone

Chief Inspector W.R. Allison

Over the Shoulder Reader

Sir Robert Bentley

Leuwen Grayle

Charles Seagrave

Giles Conover

Judge Brisson

Major Loring (uncredited)

Businessman (uncredited)

Sir Frederick Fleet

Weatherby (uncredited)

Pleyel

Colonel Fitzhume (uncredited)

Col. Herman Fournier

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

Deacon Arnold Foster

Homer

Sir Malcolm Drake (uncredited)

Mr. Charles Pryor

Attorney General (uncredited)

King Henry VI

Sir John Gresham

Aramis

Horace Granville

Lockwood

Lord Wickham

Cardinal Richelieu

Benjamin Disraeli

Fred Thomas

Ebenezer Balfour

The Sparkler

James Stratton

Corey

Jukes

King Louis XIII

Bert

Garry Ames

Feize

Harley Travers

Captain Auguste Lutte

Wriothesley

Capt. Ronald Dancy, DSO

Harry Tresham

Ambatriadi

Claude Holford

Gordon Moore

Gordon Druce

Raymond Carteret

Guy Merrow

Adolf Sperber

Sir Hugo Boycott

Capt. Gardner

Mr. Borwick

Armand de Marny

Hon Gerald Pillick

Rollo Stevens

Sir James Daring

Sir Neville Moreton

Levett

Godfrey Norton