Conrad Veidt
Otto Becker / Baron Hugo von Detner
Ann Ayars
Kaaren De Relle
Frank Reicher
Fritz
Dorothy Tree
Miss Harper
Ivan F. Simpson
Professor Sterling (as Ivan Simpson)
William Tannen
Ludwig
Martin Kosleck
Kurt Richten
Marc Lawrence
Joe Aiello
Sidney Blackmer
Arnold Milbar
Moroni Olsen
Brenner
Pierre Watkin
Grover Blaine McHenry
Rudolph Anders
Cab Driver (uncredited)
Jessie Arnold
Landlady (uncredited)
Roy Barcroft
Chief Petty Officer (uncredited)
Barbara Bedford
Woman (uncredited)
Walter Byron
Officer (uncredited)
Baldwin Cooke
Waiter (uncredited)
Stuart Crawford
Commentator (voice) (uncredited)
Mark Daniels
Cab Driver (uncredited)
Drew Demorest
Reporter (uncredited)
Herschel Graham
Reporter (uncredited)
Bernadene Hayes
Rosie (uncredited)
Edward Hearn
Reporter (uncredited)
Robert Homans
1st Captain (uncredited)
Carl M. Leviness
Onlooker at Departure (uncredited)
Wilbur Mack
Reporter (uncredited)
George Magrill
Thug (uncredited)
Frank Marlowe
Sailor (uncredited)
Charles Meakin
Restaurant Patron (uncredited)
James Millican
Operator (uncredited)
Roger Moore
Messenger (uncredited)
William Post Jr.
Harry (voice) (uncredited)
Christian Rub
Mohr (uncredited)
Tim Ryan
Officer (uncredited)
Jeffrey Sayre
Restaurant Patron (uncredited)
Charles Sherlock
Detective (uncredited)
Russell Simpson
2nd Captain (uncredited)
Hermine Sterler
Mrs. Mohr (uncredited)
Ray Teal
Officer Graves (uncredited)
Philip Van Zandt
Thug (uncredited)
Roland Varno
Bauer (uncredited)
Duke York
Sailor (uncredited)
Jeff York
Keeler (uncredited)
Joe Yule
Barney (uncredited)
William Bailey
Ernie Alexander
Sailor (uncredited)
Walter Bacon
Spy (uncredited)
Polly Bailey
Fat Woman (uncredited)
Arthur Belasco
Detective (uncredited)
Hal Cooke
Clerk (uncredited)
Clyde Courtright
Doorman (uncredited)
Jack Daley
Reporter (uncredited)
Cliff Danielson
Youth (uncredited)
Jack Deery
Diplomat (uncredited)
Harry Denny
Restaurant Patron (uncredited)
George Noisom
Bellboy (uncredited)
Paul Power
Restaurant Patron (uncredited)
Buck Russell
Restaurant Patron (uncredited)
Harry Stafford
Elderly Man (uncredited)
Tom Stevenson
Headwaiter (uncredited)
Brick Sullivan
Radio Operator (uncredited)
Margaret Bert
Joe Gilbert
Submarine Radioman (uncredited)
