Joel McCrea as Barry Corvall

Brenda Marshall as Brenda Ballard

Jeffrey Lynn as Lowell Warrington

James Stephenson as Dr. Anton Rader

Howard Hickman as Walter Forbes

Martin Kosleck as Karl 'Muller' Mullen

Nana Bryant as Mrs. Corvall

Rudolph Anders as Paul Strawn (as Robert O. Davis)

Hans Heinrich von Twardowski as Dr. Helm

George Davis as Swiss Gendarme (uncredited)

George Bancroft as Dudley Garrett

Stanley Ridges as Hamilton Peyton

Lucien Prival as Decker

Addison Richards as Bruce Corvall

Edwin Stanley as Secretary of State

Granville Bates as Phineas T. O'Grady

Grace Hayle as Mrs. O'Grady

Egon Brecher as Larsch

Emmett Vogan as Instructor

Enrique Acosta as Geneva Restaurant Patron

Eddie Acuff as Minor Role

Louis Adlon as Youth

Jimmy Aye as Geneva Restaurant Patron

Fern Barry as American Tourist

Sven Hugo Borg as Chauffeur

Sidney Bracey as Ship Steward

James Carlisle as Ball Guest

Glen Cavender as Man in O'Grady Crowd

Loia Cheaney as American Tourist

James Conaty as Ball Guest

Alice Connors as American Tourist

Jean De Briac as Waiter

Sarah Edwards as Militant American Tourist

Christian J. Frank as Minor Role

Arno Frey as Foreign Officer

Frederick Giermann as German Officer on Train

Eddie Graham as Ball Guest

John Hamilton as Code Room Instructor

Winifred Harris as Lady Ashford

John Harron as American Tourist

Stuart Holmes as American Tourist

William Hopper as Student

George Irving as State Department Official

Selmer Jackson as Instructor

Willy Kaufman as Straubel

Glenn Langan as Student

Vera Lewis as American Tourist Going to Desert

Rolf Lindau as Foreign Agent

Charles Frederick Lindsley as Announcer (voice)

Al Lloyd as American Tourist

Tony Martelli as Geneva Bartender

Chris-Pin Martin as Tunisian Guard

Billy McClain as Manservant at Ball

Robert Middlemass as Militant American Tourist

Harold Miller as Ball Guest

Jack Mower as Man Opening Door

Wendell Niles as Radio Announcer Introducing Garrett

George Reeves as Warrington's Secretary

John J. Richardson as Man in O'Grady Crowd

Cyril Ring as Spectator at Dart Throwing

Lionel Royce as Hoffmeyer

Milton Royce as Ball Guest

Sally Sage as American Tourist

Alexander Schoenberg as Man at Canteen

Ferdinand Schumann-Heink as Train Conductor

Hans Schumm as Foreign Official

Lester Sharpe as German Officer on Train

Bert Stevens as Student

Don Turner as Pilot with Map

Dorothy Vaughan as Stout Woman Bumped by Garrett

Henry Victor as Foreign Official

Frederick Vogeding as Friend of Müller

Wilhelm von Brincken as Foreign Official

Nella Walker as Mrs. Peyton

Lottie Williams as American Tourist Wanting Boat Out

William Worthington as Instructor in Montage

Wolfgang Zilzer as Heinrich

Henry Zynda as Guard