 | Edward Judd als Arnold Bedford |
 | Martha Hyer als Kate Callender |
 | Lionel Jeffries als Joseph Cavor |
 | Miles Malleson als Dymchurch Registrar |
 | Norman Bird als Stuart |
 | Gladys Henson als Nursing Home Matron |
 | Hugh McDermott als Richard Challis |
 | Betty McDowall als Margaret Hoy |
 | Erik Chitty als Gibbs (uncredited) |
 | Douglas Ives als Sparks (uncredited) |
 | Peter Finch als Bailiff's Man (uncredited) |
 | Marne Maitland als Dr. Tok, UN Space Agency (uncredited) |
 | Laurence Herder als Glushkov, UN Space Agency |
 | Paul Carpenter als Reporter from the 'Express' (uncredited) |
 | John Forbes-Robertson als First Reporter (uncredited) |
| Kenneth Watson als Second Reporter (uncredited) |
| Sean Kelly als Col. Rice, Moon Landing Crew (uncredited) |
| Gordon Robinson als Sgt Andrew Martin, Moon Landing Crew (uncredited) |
| John Murray Scott als Cosmonaut Nevsky, Moon Landing Crew (uncredited) |
| Brook Williams als British Astronaut, Moon Landing Crew (uncredited) |
| George Hilsdon als Constable (uncredited) |
| Mary Maxfield als Nurse (uncredited) |
| Huw Thomas als Announcer (uncredited) |
 | Valentine Dyall als Narrator (uncredited) |
| Nathan H. Juran | Director |
| Jan Read | Screenplay |
| Nigel Kneale | Screenplay |
| Charles H. Schneer | Producer |
| Wilkie Cooper | Director of Photography |
| Laurie Johnson | Original Music Composer |
| John Blezard | Art Direction |
| Maurice Rootes | Editor |
| Basil Mannin | Scenic Artist |
| Ray Harryhausen | Visual Effects |
| Ted Wallis | Production Manager |
| Les Bowie | Other |
| Kit West | Other |
| Harry Gillam | Camera Operator |
| George Pollard | Assistant Director |
| Eileen Head | Continuity |
| Buster Ambler | Sound Recordist |
| Red Law | Sound Recordist |
| Sam Suliman | Title Designer |
| Arthur Garratt | Technical Advisor |
| H.G. Wells | Original Story |
