Test space rockets exploding at liftoff and increased reporting of UFO sightings culminate in a direct attempt by alien survivors of a dead, extra-galactic civilization to invade Earth from impervious flying saucers, using ray-weapons of mass destruction.
| Writing | Donald E. Keyhoe | Novel |
| Writing | George Worthing Yates | Screenplay |
| Writing | Curt Siodmak | Screenstory |
| Writing | Bernard Gordon | Screenplay |
| Directing | Fred F. Sears | Director |
| Visual Effects | Ray Harryhausen | Visual Effects |
| Editing | Danny B. Landres | Editor |
| Directing | Gene Anderson Jr. | Assistant Director |
| Production | Charles H. Schneer | Producer |
| Sound | J.S. Westmoreland | Sound |
| Production | Leon Chooluck | Unit Manager |
| Art | Paul Palmentola | Art Direction |
| Crew | Russ Kelley | Special Effects |
| Production | Jack Erickson | Production Coordinator |
| Camera | Fred Jackman Jr. | Director of Photography |
| Art | Sidney Clifford | Set Decoration |
| Production | Sam Katzman | Executive Producer |
