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