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