 William PowellLt. William 'Bill' Gordon / Anson Meridan | Lt. William 'Bill' Gordon / Anson Meridan |
 Rosalind RussellJoel Carter | Joel Carter |
 Binnie BarnesOlivia Karloff | Olivia Karloff |
 Lionel AtwillMaj. William Brennan | Maj. William Brennan |
 Cesar RomeroCapt. Nicholas 'Nikki' Nieterstein | Capt. Nicholas 'Nikki' Nieterstein |
 Samuel S. HindsJohn Carter, Assistant Secretary of War | John Carter, Assistant Secretary of War |
 Henry StephensonRussian Ambassador Gregory | Russian Ambassador Gregory |
 Frank ReicherDr. R.A. Jackson | Dr. R.A. Jackson |
 Charley GrapewinProf. Martin | Prof. Martin |
 Leonard MudieRoberts | Roberts |
 Howard HickmanG-Man | G-Man |
 Charles TrowbridgeSecretary of War Baker | Secretary of War Baker |
 Murray Kinnellde Segroff | de Segroff |
 Margaret DumontMrs. Hendricks (uncredited) | Mrs. Hendricks (uncredited) |
 Mary ForbesLady Cavendish (uncredited) | Lady Cavendish (uncredited) |
 Tom DuganAgent Patrick O'Reilly (uncredited) | Agent Patrick O'Reilly (uncredited) |
 Bernadene HayesBobbie Burns (uncredited) | Bobbie Burns (uncredited) |
 Winter HallChaplain (uncredited) | Chaplain (uncredited) |
 Hedwiga ReicherDe Segroff's Associate (uncredited) | De Segroff's Associate (uncredited) |
 Milburn StoneCarter's Aide (uncredited) | Carter's Aide (uncredited) |
 Theodore von EltzDesk Clerk Assistant (uncredited) | Desk Clerk Assistant (uncredited) |
 Sid SilversRecruiter (uncredited) | Recruiter (uncredited) |
 Sidney BraceyJackson's Assistant (uncredited) | Jackson's Assistant (uncredited) |
 Edgar Dearing1st Military Policeman (uncredited) | 1st Military Policeman (uncredited) |
 James Flavin2st Military Policeman (uncredited) | 2st Military Policeman (uncredited) |
 Hans FuerbergGerman Torpedo Man (uncredited) | German Torpedo Man (uncredited) |
 Sterling HollowayTaxi Driver (uncredited) | Taxi Driver (uncredited) |
 William V. MongHotel Desk Clerk (uncredited) | Hotel Desk Clerk (uncredited) |
 Mickey RooneyCountry Boy (uncredited) | Country Boy (uncredited) |
 Melville CooperDoorman (uncredited) | Doorman (uncredited) |
