 | Kenneth Tobey als Cmdr. Pete Mathews |
 | Faith Domergue als Prof. Lesley Joyce |
 | Donald Curtis als Dr. John Carver |
 | Chuck Griffiths als Lt. Griff, USN |
 | Ian Keith als Adm. Burns |
| Dean Maddox Jr. als Adm. Norman |
 | Harry Lauter als Deputy Bill Nash |
| Richard W. Peterson als Capt. Stacy |
| George Worthing Yates | Screenplay |
| Charles H. Schneer | Producer |
| Sam Katzman | Executive Producer |
| Jack Erickson | Special Effects |
| Ray Harryhausen | Visual Effects |
| Harold Jacob Smith | Screenplay |
| Henry Freulich | Director of Photography |
| Jerome Thoms | Editor |
| Paul Palmentola | Art Direction |
| Sidney Clifford | Set Decoration |
| J.S. Westmoreland | Sound |
| George Worthing Yates | Story |
| Leonard Katzman | Assistant Director |
| Mischa Bakaleinikoff | Conductor |
| Leon Chooluck | Unit Manager |
| Robert Gordon | Director |
