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Tristram Coffin as Prof. Jeff King |
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Mae Clarke as Glenda Thomas |
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Don Haggerty as Tony Dirken |
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House Peters Jr. as Burt Winslow |
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James Craven as Prof. Millard |
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I. Stanford Jolley as Prof. Bryant |
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Ted Adams as Martin Conway |
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Marshall Bradford as Dr. Graffner |
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Stanley Price as Gunther von Strum |
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Douglas Evans as Civil Defense Chairman |
|
Arvon Dale as Chairman's Aide |
|
Tom Steele as Henchman |
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Dale Van Sickel as Henchman |
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David Sharpe as Henchman |
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Carey Loftin as Henchman |
|
Bud Wolfe as Henchman |
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Frank O'Connor as Old Watchman |
 |
Art Gilmore as Radio Voice |
| Directing | Fred C. Brannon | Director |
| Writing | Royal K. Cole | Writer |
| Writing | William Lively | Writer |
| Writing | Sol Shor | Writer |
