During the US Civil War, Union POWs escape in a balloon and end up stranded on a South Pacific island, inhabited by giant plants and animals. They must use their ingenuity to survive the dangers, and to devise a way to return home. Sequel to '20,000 Leagues Under the Sea' .
| Directing | Cy Endfield | Director |
| Camera | Wilkie Cooper | Director of Photography |
| Production | Charles H. Schneer | Producer |
| Writing | Daniel B. Ullman | Screenplay |
| Writing | Jules Verne | Novel |
| Writing | John Prebble | Screenplay |
| Writing | Crane Wilbur | Screenplay |
| Sound | Bernard Herrmann | Original Music Composer |
| Editing | Frederick Wilson | Editor |
| Art | William C. Andrews | Art Direction |
| Visual Effects | Ray Harryhausen | Visual Effects |
| Sound | Peter Handford | Sound Recordist |
| Sound | Bob Jones | Sound Recordist |
| Production | Robert Sterne | Production Manager |
| Directing | René Dupont | Assistant Director |
| Production | Raymond Anzarut | Production Supervisor |
| Camera | Egil S. Woxholt | Underwater Camera |
| Camera | Jack Mills | Camera Operator |
| Directing | Marjorie Lavelly | Continuity |
| Sound | John Cox | Sound Supervisor |
| Art | Bob Gill | Title Designer |
| Sound | Bernard Herrmann | Conductor |
