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Arthur Franz as Richard "Reef" Holloway |
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Dick Foran as Dan Wendover |
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Brett Halsey as Carl Neilson Jr. |
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Tom Conway as Ian Hunt |
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Paul Dubov as David Milburn |
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Bob Steele as "Grif" Griffin |
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Victor Varconi as Clifford Kent |
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Joi Lansing as Julie |
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Selmer Jackson as Admiral Terhune |
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Jack Mulhall as Justin Murdock |
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Jean Moorhead as Helen Milburn |
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Richard Tyler as Frogman Carney |
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Kenneth Becker as Frogman Powell |
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Sid Melton as Chester Tuttle |
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Frank Watkins as Watkins |
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Pat Michaels as Narrator |
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John Hilliard as Saucer Voice (voice) |
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Edmund Cobb as Passerby (uncredited) |
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Frank Lackteen as Passerby (uncredited) |
| Production | Alex Gordon | Producer |
| Camera | Gilbert Warrenton | Director of Photography |
| Writing | Jack Rabin | Story |
| Writing | Orville H. Hampton | Writer |
| Writing | Irving Block | Story |
| Directing | Spencer Gordon Bennet | Director |
| Crew | Irving Block | Special Effects |
| Crew | Louis DeWitt | Special Effects |
| Editing | William Austin | Editor |
| Crew | Jack Rabin | Special Effects |
| Sound | Alexander Laszlo | Original Music Composer |
| Production | Irving Block | Associate Producer |
| Art | Don Ament | Art Direction |
| Production | Jack Rabin | Associate Producer |
| Production | Henry Schrage | Co-Producer |
| Production | Orville H. Hampton | Associate Producer |
| Art | Daniel Haller | Art Direction |
| Art | Max Frankel | Property Master |
| Directing | Clark L. Paylow | Assistant Director |
| Lighting | George Satterfield | Electrician |
| Directing | Judith Hart | Script Supervisor |
| Art | Harry Reif | Set Decoration |
| Production | Edward Morey Jr. | Production Manager |
| Crew | Milton Olsen | Special Effects |
| Costume & Make-Up | Emile LaVigne | Makeup Artist |
| Sound | Ralph Butler | Sound |
| Camera | Arthur Lane | Camera Operator |
| Directing | Arthur M. Broidy | Assistant Director |
| Sound | Neil Brunnenkant | Music Editor |
| Costume & Make-Up | Norah Sharpe | Wardrobe Assistant |
| Costume & Make-Up | Roger J. Weinberg | Wardrobe Assistant |
| Sound | Martin Greco | Sound Editor |
| Camera | Harry Lewis | Grip |
