Brian Donlevy as Dr. Franticek Svoboda

Walter Brennan as Prof. Stephen Novotny

Anna Lee as Masha Novotny

Gene Lockhart as Emil Czaka

Dennis O'Keefe as Jan Horak

Margaret Wycherly as Ludmilla Novotny

Nana Bryant as Mrs. Hellie Novotny

William Roy as Boda Novotny

Hans Heinrich von Twardowski as Reinhard Heydrich

Alexander Granach as Gestapo Insp. Alois Gruber

Tonio Selwart as Chief of Gestapo Kurt Haas

Jonathan Hale as Dedic

Lionel Stander as Banya

Sarah Padden as Mrs. Georgia Dvorak

Edmund MacDonald as Dr. Pillar

Byron Foulger as Bartos

Virginia Farmer as Mrs. Nimitz

Ludwig Donath as Schirmer

George Irving as Neeval

James Bush as Peacock

Arno Frey as Camp Lieutenant Itnut

Lester Sharpe as Rudy

Arthur Loft as Gen. Votruba

Reinhold Schünzel as Gestapo Insp. Ritter

Chester Conklin as Cook (uncredited)

Claire McDowell as Counterwoman (uncredited)

John Abbott as Hostage (scenes deleted)

Louis Adlon as Adjutant (uncredited)

Erville Alderson as Liberal Official (uncredited)

Richard Alexander as Slugger in Theater (uncredited)

Dwight Frye as Hostage

Ralph Dunn as Czech Policeman (uncredited)

Bud Jamison as Fat Man (uncredited)

Philip Van Zandt as Officer (uncredited)

Sam Harris as Man at Briefing (uncredited)