Joel McCrea

Barry Corvall

Brenda Marshall

Brenda Ballard

Jeffrey Lynn

Lowell Warrington

James Stephenson

Dr. Anton Rader

Howard Hickman

Walter Forbes

Martin Kosleck

Karl 'Muller' Mullen

Nana Bryant

Mrs. Corvall

Rudolph Anders

Paul Strawn (as Robert O. Davis)

Hans Heinrich von Twardowski

Dr. Helm

George Davis

Swiss Gendarme (uncredited)

George Bancroft

Dudley Garrett

Stanley Ridges

Hamilton Peyton

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

Sven Hugo Borg

Chauffeur

Sidney Bracey

Ship Steward

Glen Cavender

Man in O'Grady Crowd

Jean De Briac

Waiter

Sarah Edwards

Militant American Tourist

Christian J. Frank

Minor Role

John Hamilton

Code Room Instructor

Winifred Harris

Lady Ashford

John Harron

American Tourist

Stuart Holmes

American Tourist

William Hopper

Student

George Irving

State Department Official

Selmer Jackson

Instructor

Glenn Langan

Student

Vera Lewis

American Tourist Going to Desert

Chris-Pin Martin

Tunisian Guard

Billy McClain

Manservant at Ball

Robert Middlemass

Militant American Tourist

Harold Miller

Ball Guest

Jack Mower

Man Opening Door

Wendell Niles

Radio Announcer Introducing Garrett

George Reeves

Warrington's Secretary

John J. Richardson

Man in O'Grady Crowd

Cyril Ring

Spectator at Dart Throwing

Lionel Royce

Hoffmeyer

Ferdinand Schumann-Heink

Train Conductor

Bert Stevens

Student

Dorothy Vaughan

Stout Woman Bumped by Garrett

Henry Victor

Foreign Official

Frederick Vogeding

Friend of Müller

Wilhelm von Brincken

Foreign Official

Nella Walker

Mrs. Peyton

William Worthington

Instructor in Montage

Wolfgang Zilzer

Heinrich