 | Raymond Massey als John Cabal / Oswald Cabal |
 | Edward Chapman als Pippa Passworthy / Raymond Passworthy |
 | Ralph Richardson als The Boss |
 | Margaretta Scott als Roxana / Rowena |
 | Cedric Hardwicke als Theotocopulos |
 | Maurice Braddell als Dr. Harding |
 | Sophie Stewart als Mrs. Cabal |
 | Derrick De Marney als Richard Gordon |
 | Ann Todd als Mary Gordon |
 | Pearl Argyle als Catherine Cabal |
| Kenneth Villiers als Maurice Passworthy |
| Ivan Brandt als Morden Mitani |
| Anne McLaren als The Child |
 | Patricia Hilliard als Janet Gordon |
 | Charles Carson als Great Grandfather |
 | Patrick Barr als World Transport Official (uncredited) |
| Noel Brophy als Irishman (uncredited) |
 | John Clements als The Airman (uncredited) |
| Anthony Holles als Simon Burton (uncredited) |
 | Allan Jeayes als Mr. Cabal (uncredited) |
| Pickles Livingston als Horrie Passworthy (uncredited) |
 | George Sanders als Celestial Body (uncredited) |
 | Abraham Sofaer als The Jew (uncredited) |
 | Terry-Thomas als Man of the Future (uncredited) |
| Alexander Korda | Producer |
| Charles Crichton | Editor |
| Francis D. Lyon | Editor |
| H.G. Wells | Novel |
| Cathleen Mann | Costume Design |
| H.G. Wells | Screenplay |
| Arthur Bliss | Original Music Composer |
| Georges Périnal | Director of Photography |
| John Armstrong | Costume Design |
| Sam Williams | Costume Design |
| René Hubert | Costume Design |
| William Cameron Menzies | Director |
| Vincent Korda | Art Direction |
| David B. Cunynghame | Production Manager |
| Geoffrey Boothby | Assistant Director |
| Ned Mann | Special Effects |
| Muir Mathieson | Music Director |
| A.W. Watkins | Recording Supervision |
| Frank Wells | Assistant Art Director |
| Nigel Tangye | Technical Advisor |
| William Hornbeck | Supervising Editor |
| Edward Cohen | Special Effects |
| Lawrence W. Butler | Special Effects Assistant |
| Robert Krasker | Camera Operator |
