Joel McCrea
— Barry Corvall
Brenda Marshall
— Brenda Ballard
Jeffrey Lynn
— Lowell Warrington
Nana Bryant
— Mrs. Corvall
Martin Kosleck
— Karl 'Muller' Mullen
Rudolph Anders
— Paul Strawn (as Robert O. Davis)
James Stephenson
— Dr. Anton Rader
George Bancroft
— Dudley Garrett
Stanley Ridges
— Hamilton Peyton
Howard Hickman
— Walter Forbes
Hans Heinrich von Twardowski
— Dr. Helm
George Davis
— Swiss Gendarme (uncredited)
Lucien Prival
— Decker
Addison Richards
— Bruce Corvall
Edwin Stanley
— Secretary of State
Granville Bates
— Phineas T. O'Grady
Grace Hayle
— Mrs. O'Grady
Egon Brecher
— Larsch
Emmett Vogan
— Instructor
Enrique Acosta
— Geneva Restaurant Patron
Eddie Acuff
— Minor Role
Louis Adlon
— Youth
Jimmy Aye
— Geneva Restaurant Patron
Fern Barry
— American Tourist
Sven Hugo Borg
— Chauffeur
Sidney Bracey
— Ship Steward
James Carlisle
— Ball Guest
Glen Cavender
— Man in O'Grady Crowd
Loia Cheaney
— American Tourist
James Conaty
— Ball Guest