"The Invisible Man's grandson uses his secret formula to spy on Nazi Germany in this comedy-thriller."
Ilona Massey
as Maria Sorenson
Jon Hall
as Frank Raymond
Peter Lorre
as Baron Ikito
Cedric Hardwicke
as Conrad Stauffer
J. Edward Bromberg
as Karl Heiser
Albert Bassermann
as Arnold Schmidt
John Litel
as John Gardiner
Holmes Herbert
as Sir Alfred Spencer
Keye Luke
as Surgeon
Sven Hugo Borg
as German Captain (uncredited)
John Burton
as R.A.F. Flier (uncredited)
Lane Chandler
as German Sentry (uncredited)
Mabel Colcord
as Gretl (uncredited)
James Craven
as Ship's Radio Man (uncredited)
Donald Curtis
Leslie Denison
as British Radio Operator (uncredited)
Eddie Dunn
as S.S. Prison Guard (uncredited)
Lee Tung Foo
as Gen. Chin Lee (uncredited)
Henry Guttman
as Storm Trooper (uncredited)
Bobby Hale
as English Tommy (uncredited)
John Holland
as Spencer's Secretary (uncredited)
Patrick McVey
as German (uncredited)
John Merton
as German Soldier (uncredited)
Alberto Morin
as Free Frenchman (uncredited)
Ferdinand Munier
as Bartender (uncredited)
William Pagan
Eddie Parker
as Strongman Thug (uncredited)
Charles Regan
as Ordnance Car Driver (uncredited)
Otto Reichow
as Gestapo Agent (uncredited)
William Ruhl
Ferdinand Schumann-Heink
as German Telephone Operator (uncredited)
Hans Schumm
as SS Man (uncredited)
Wallace Scott
Lee Shumway
as Brigadier (uncredited)
Milburn Stone
as German Sergeant (uncredited)
Walter Tetley
as Newsboy (uncredited)
Philip Van Zandt
Michael Visaroff
as Verichen (uncredited)
Phil Warren
Pat West
as German Taxi Driver (uncredited)
Matt Willis
as Nazi Assassin (uncredited)
Duke York
Wolfgang Zilzer
as Von Porten (uncredited)
Victor Zimmerman
Henry Zynda
as Col. Kelenski (uncredited)
Charles Flynn
H.G. Wells
Novel
Frank Lloyd
Producer
Edwin L. Marin
Director
Jack Otterson
Art Direction
Vera West
Costume Design
Edward Curtiss
Editor
George Waggner
Associate Producer
Lester White
Director of Photography
Hans J. Salter
Original Music Composer
John P. Fulton
Visual Effects
Russell A. Gausman
Set Decoration
Vernon Keays
Assistant Director
Robert F. Boyle
Assistant Art Director
William Hedgcock
Sound Engineer
David S. Horsley
Special Effects
Roswell A. Hoffmann
Visual Effects Camera
Music Director
Bernard B. Brown
Sound Director
Frank Skinner
Music
Edward R. Robinson
Assistant Set Decoration
Curt Siodmak
Screenplay
Stunts
Richard Hageman
