Cast
Emmett Vogan
Instructor
Jean De Briac
Waiter
Christian J. Frank
Minor Role
Ferdinand Schumann-Heink
Train Conductor
Dorothy Vaughan
Stout Woman Bumped by Garrett
Brenda Marshall
Brenda Ballard
John Harron
American Tourist
Glenn Langan
Student
Addison Richards
Bruce Corvall
Grace Hayle
Mrs. O'Grady
Wolfgang Zilzer
Heinrich
Joel McCrea
Barry Corvall
Jeffrey Lynn
Lowell Warrington
Nana Bryant
Mrs. Corvall
Rudolph Anders
Paul Strawn (as Robert O. Davis)
Selmer Jackson
Instructor
Louis Adlon
Youth
Sven Hugo Borg
Chauffeur
George Irving
State Department Official
Billy McClain
Manservant at Ball
Henry Victor
Foreign Official
Nella Walker
Mrs. Peyton
John J. Richardson
Man in O'Grady Crowd
Lester Sharpe
German Officer on Train
Jack Mower
Man Opening Door
Hans Heinrich von Twardowski
Dr. Helm
James Stephenson
Dr. Anton Rader
Cyril Ring
Spectator at Dart Throwing
Lionel Royce
Hoffmeyer
William Worthington
Instructor in Montage
Stanley Ridges
Hamilton Peyton
John Hamilton
Code Room Instructor
Lucien Prival
Decker
Martin Kosleck
Karl 'Muller' Mullen
Granville Bates
Phineas T. O'Grady
Sidney Bracey
Ship Steward
Hans Schumm
Foreign Official
Frederick Vogeding
Friend of Müller
George Bancroft
Dudley Garrett
Egon Brecher
Larsch
George Reeves
Warrington's Secretary
Chris-Pin Martin
Tunisian Guard
Eddie Acuff
Minor Role
Stuart Holmes
American Tourist
William Hopper
Student
Wendell Niles
Radio Announcer Introducing Garrett
Glen Cavender
Man in O'Grady Crowd
Winifred Harris
Lady Ashford
Sarah Edwards
Militant American Tourist
Vera Lewis
American Tourist Going to Desert
George Davis
Swiss Gendarme (uncredited)
Enrique Acosta
Geneva Restaurant Patron
Robert Middlemass
Militant American Tourist
Wilhelm von Brincken
Foreign Official
Howard Hickman
Walter Forbes
Edwin Stanley
Secretary of State
Harold Miller
Ball Guest