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

Ernie Alexander

Sailor (uncredited)

Rudolph Anders

Cab Driver (uncredited)

Jessie Arnold

Landlady (uncredited)

Walter Bacon

Spy (uncredited)

Polly Bailey

Fat Woman (uncredited)

Roy Barcroft

Chief Petty Officer (uncredited)

Barbara Bedford

Woman (uncredited)

Arthur Belasco

Detective (uncredited)

Walter Byron

Officer (uncredited)

Baldwin Cooke

Waiter (uncredited)

Hal Cooke

Clerk (uncredited)

Clyde Courtright

Doorman (uncredited)

Stuart Crawford

Commentator (voice) (uncredited)

Jack Daley

Reporter (uncredited)

Mark Daniels

Cab Driver (uncredited)

Cliff Danielson

Youth (uncredited)

Jack Deery

Diplomat (uncredited)

Drew Demorest

Reporter (uncredited)

Harry Denny

Restaurant Patron (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)

George Noisom

Bellboy (uncredited)

William Post Jr.

Harry (voice) (uncredited)

Paul Power

Restaurant Patron (uncredited)

Christian Rub

Mohr (uncredited)

Buck Russell

Restaurant Patron (uncredited)

Tim Ryan

Officer (uncredited)

Jeffrey Sayre

Restaurant Patron (uncredited)

Charles Sherlock

Detective (uncredited)

Russell Simpson

2nd Captain (uncredited)

Harry Stafford

Elderly Man (uncredited)

Hermine Sterler

Mrs. Mohr (uncredited)

Tom Stevenson

Headwaiter (uncredited)

Brick Sullivan

Radio Operator (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

Margaret Bert

Joe Gilbert

Submarine Radioman (uncredited)