| Carole Lombard | Maria Tura |
| Jack Benny | Joseph Tura/Prof. Alexander Siletsky |
| Robert Stack | Lt. Stanislav Sobinski |
| Felix Bressart | Greenberg |
| Lionel Atwill | Rawitch |
| Stanley Ridges | Prof. Alexander Siletsky |
| Sig Ruman | Col. Ehrhardt |
| Tom Dugan | Bronski |
| Charles Halton | Dobosh |
| Peter Caldwell | Wilhelm (uncredited) |
| Helmut Dantine | Co-pilot (uncredited) |
| Otto Reichow | Co-pilot (uncredited) |
| Miles Mander | Maj. Cunningham |
| George Lynn | Actor Playing Hitler's Adjutant |
| Henry Victor | Capt. Schultz |
| Maude Eburne | Anna, Maria's maid |
| Halliwell Hobbs | Gen. Armstrong |
| Olaf Hytten | Polonius in Warsaw (uncredited) |
Husband-and-wife troupers must act fast to fool Nazis in Poland.
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