 |
Charles Drake as Dr. Ralph Harrison |
 |
Karin Booth as Janice Roberts |
 |
Billy Chapin as Brian 'Gadge' Roberts |
 |
Taylor Holmes as Prof. Arnold Nordstrom |
 |
Steven Geray as The Foreign Spy-Chief |
 |
Henry Kulky as Paul (Spy Henchman) |
 |
Franz Roehn as Karl |
 |
Hal Baylor as Max (Spy Henchman) |
 |
William Schallert as Johnston - a Reporter |
 |
Lyle Talbot as An Admiral |
| Writing | Philip MacDonald | Screenplay |
| Writing | Carl Dudley | Story |
| Production | Richard Goldstone | Producer |
| Directing | Lee Sholem | Director |
| Crew | Howard Lydecker | Special Effects |
| Costume & Make-Up | Bob Mark | Makeup Artist |
| Editing | Basil Wrangell | Editor |
| Sound | Howard Jackson | Original Music Composer |
| Art | Edward G. Boyle | Set Decoration |
| Art | Gabriel Scognamillo | Art Direction |
| Camera | John L. Russell | Director of Photography |
| Production | Orville Fouse | Production Supervisor |
| Art | John McCarthy Jr. | Set Decoration |
| Crew | Theodore Lydecker | Special Effects |
