 | Ilona Massey als Maria Sorenson |
 | Jon Hall als Frank Raymond |
 | Peter Lorre als Baron Ikito |
 | Cedric Hardwicke als Conrad Stauffer |
 | J. Edward Bromberg als Karl Heiser |
 | Albert Bassermann als Arnold Schmidt |
 | John Litel als John Gardiner |
 | Holmes Herbert als Sir Alfred Spencer |
 | Keye Luke als Surgeon |
 | Sven Hugo Borg als German Captain (uncredited) |
 | John Burton als R.A.F. Flier (uncredited) |
 | Lane Chandler als German Sentry (uncredited) |
| Mabel Colcord als Gretl (uncredited) |
 | James Craven als Ship's Radio Man (uncredited) |
 | Donald Curtis als German Sentry (uncredited) |
| Leslie Denison als British Radio Operator (uncredited) |
 | Eddie Dunn als S.S. Prison Guard (uncredited) |
| Charles Flynn als German Soldier (uncredited) |
 | Lee Tung Foo als Gen. Chin Lee (uncredited) |
| Henry Guttman als Storm Trooper (uncredited) |
| Bobby Hale als English Tommy (uncredited) |
 | John Holland als Spencer's Secretary (uncredited) |
 | Patrick McVey als German (uncredited) |
 | John Merton als German Soldier (uncredited) |
 | Alberto Morin als Free Frenchman (uncredited) |
| Ferdinand Munier als Bartender (uncredited) |
| William Pagan als Storm Trooper (uncredited) |
 | Eddie Parker als Strongman Thug (uncredited) |
| Charles Regan als Ordnance Car Driver (uncredited) |
 | Otto Reichow als Gestapo Agent (uncredited) |
| William Ruhl als Gestapo Agent (uncredited) |
 | Ferdinand Schumann-Heink als German Telephone Operator (uncredited) |
| Hans Schumm als SS Man (uncredited) |
| Wallace Scott als English Tommy (uncredited) |
 | Lee Shumway als Brigadier (uncredited) |
 | Milburn Stone als German Sergeant (uncredited) |
 | Walter Tetley als Newsboy (uncredited) |
 | Philip Van Zandt als SS Man (uncredited) |
 | Michael Visaroff als Verichen (uncredited) |
| Phil Warren als German Soldier (uncredited) |
| Pat West als German Taxi Driver (uncredited) |
 | Matt Willis als Nazi Assassin (uncredited) |
 | Duke York als German Sentry (uncredited) |
 | Wolfgang Zilzer als Von Porten (uncredited) |
| Victor Zimmerman als Storm Trooper (uncredited) |
| Henry Zynda als Col. Kelenski (uncredited) |
| Frank Lloyd | Producer |
| H.G. Wells | Novel |
| Edwin L. Marin | Director |
| Edward Curtiss | Editor |
| Vera West | Costume Design |
| George Waggner | Associate Producer |
| John P. Fulton | Visual Effects |
| Jack Otterson | Art Direction |
| Lester White | Director of Photography |
| Russell A. Gausman | Set Decoration |
| Hans J. Salter | Original Music Composer |
| Roswell A. Hoffmann | Visual Effects |
| Curt Siodmak | Screenplay |
| Vernon Keays | Assistant Director |
| Robert F. Boyle | Assistant Art Director |
| Edward R. Robinson | Assistant Set Decoration |
| Bernard B. Brown | Sound Director |
| William Hedgcock | Sound Engineer |
| David S. Horsley | Special Effects |
| John P. Fulton | Visual Effects Camera |
| Roswell A. Hoffmann | Visual Effects Camera |
| Eddie Parker | Stunts |
| Duke York | Stunts |
| Hans J. Salter | Music Director |
| Richard Hageman | Music |
| Frank Skinner | Music |
