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Bruce Edwards as Steve Colt |
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Virginia Lee as Joyce Winters (as Virginia Lindley) |
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Carol Forman as Sombra, The Black Widow |
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Anthony Warde as Nick Ward |
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Ramsay Ames as Ruth Dayton |
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I. Stanford Jolley as Dr. Z.V. Jaffa |
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Dave Anderson as Porter-Spy |
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Theodore Gottlieb as Hitomu |
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Virginia Carroll as Dr. Ann Curry |
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Gene Roth as John M. Walker |
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Sam Flint as Prof. Henry Weston |
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LeRoy Mason as Dr. Godfrey |
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Forrest Taylor as Bradley |
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Ernie Adams as Blinky |
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Keith Richards as Michael Burns |
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George Chesebro as J. Carter |
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Frank Lackteen as A. Kabob |
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Carey Loftin as Spike |
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Ted Mapes as Slade |
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Jack O'Shea as Finnegan |
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Gil Perkins as Burke |
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John Phillips as District Attorney Mark |
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Stanley Price as Filmore Hagen |
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Larry Steers as Dr. Harcourt |
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Ken Terrell as Mendoza |
| Directing | Spencer Gordon Bennet | Director |
| Directing | Fred C. Brannon | Director |
| Editing | Sam Starr | Editor |
| Editing | Cliff Bell Sr. | Editor |
| Production | M.J. Frankovich | Associate Producer |
| Camera | John MacBurnie | Director of Photography |
| Art | John McCarthy Jr. | Set Decoration |
| Art | Fred A. Ritter | Art Direction |
| Art | James Redd | Set Decoration |
| Production | Anthony Hinds | Producer |
