Barry Corvall
Brenda Ballard
Lowell Warrington
Dudley Garrett
Hamilton Peyton
Dr. Rader
Walter Forbes
Karl Mullen
Mrs. Corvall
Paul Strawn (as Robert O. Davis)
Dr. Helm (as Hans Von Twardowski)
Decker
Bruce Corvall
Secretary of State
Phineas T. O'Grady
Mrs. O'Grady
Larsch
Instructor (as Emmet Vogan)
Geneva Restaurant Patron (uncredited)
Minor Role (uncredited)
Youth (uncredited)
American Tourist (uncredited)
Chauffeur (uncredited)
Ship Steward (uncredited)
Ball Guest (uncredited)
Man in O'Grady Crowd (uncredited)
Swiss Gendarme (uncredited)
Waiter (uncredited)
Militant American Tourist (uncredited)
Foreign Officer (uncredited)
German Officer on Train (uncredited)
Servant at Ball (uncredited)
Code Room Instructor (uncredited)
Lady Ashford (uncredited)
Student (uncredited)
State Department Official (uncredited)
Instructor (uncredited)
Straubel (uncredited)
American Tourist Going to Desert (uncredited)
Foreign Agent (uncredited)
Announcer (voice) (uncredited)
Geneva Bartender (uncredited)
Tunisian Guard (uncredited)
Manservant at Ball (uncredited)
Man Opening Door (uncredited)
Radio Announcer Introducing Garrett (uncredited)
Warrington's Secretary (uncredited)
Spectator at Dart Throwing (uncredited)
Hoffmeyer (uncredited)
Man at Canteen (uncredited)
Train Conductor (uncredited)
Foreign Official (uncredited)
Pilot with Map (uncredited)
Stout Woman Bumped by Garrett (uncredited)
Friend of Müller (uncredited)
Mrs. Peyton (uncredited)
American Tourist Wanting Boat Out (uncredited)
Instructor in Montage (uncredited)
Heinrich (uncredited)
Guard (uncredited)