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Craig Stevens as Col. Joe Parkman |
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William Hopper as Dr. Nedrick 'Ned' Jackson |
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Alix Talton as Marge Blaine |
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Donald Randolph as Gen. Mark Ford |
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Florenz Ames as Prof. Anton Gunther |
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Paul Smith as Corporal |
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Paul Campbell as Lt. Fred Pizar |
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Pat Conway as Sgt. Pete Allen |
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Phil Harvey as Lou |
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Helen Jay as Mrs. Farley |
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Bing Russell as State Trooper |
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David McMahon as Capt. Frank Carver |
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Marvin Miller as Narrator (voice) |
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Michael Forest as Photographer (uncredited) |
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Sumner Williams as C-47 Pilot (uncredited) |
| Writing | William Alland | Story |
| Editing | Chester W. Schaeffer | Editor |
| Camera | Ellis W. Carter | Director of Photography |
| Directing | Nathan Juran | Director |
| Production | William Alland | Producer |
| Sound | William Lava | Original Music Composer |
| Art | Alexander Golitzen | Art Direction |
| Visual Effects | Clifford Stine | Visual Effects |
| Sound | Irving Gertz | Original Music Composer |
| Writing | Martin Berkeley | Screenplay |
| Art | Robert Clatworthy | Art Direction |
| Costume & Make-Up | Jay A. Morley Jr. | Costume Design |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Directing | William Holland | Assistant Director |
| Art | Oliver Emert | Set Decoration |
| Art | Russell A. Gausman | Set Decoration |
