- Bernard Gordonscreenplay &
- Curt Siodmakscreen story
- Donald E. Keyhoesupported by "Flying Saucers from Outer Space" by (as Major Donald E. Keyhoe)
- Thomas Browne Henry(as Tom Browne Henry)
- Larry J. Blake(as Larry Blake)
Rest of cast listed alphabetically
- Jimmy Cross(uncredited)
- Jack Deery(uncredited)
- Charles Evans(uncredited)
- Raoul Freeman(uncredited)
- Paul Frees(voice) (uncredited)
- James Gonzalez(uncredited)
- Duke Green(uncredited)
- Ed Haskett(uncredited)
- Clark Howat(uncredited)
- Don Marlowe(uncredited)
- Sol Murgi(uncredited)
- William J. O'Brien(archive footage) (uncredited)
- Murray Pollack(uncredited)
- Mike Ragan(uncredited)
- Alan Reynolds(uncredited)
- Guy Way(uncredited)
- Bob Whitney(uncredited)
- Frank Wilcox(uncredited)
- Beal Wong(uncredited)
- William Woodson(voice) (uncredited)
- Sam Katzmanexecutive producer
- Charles H. Schneerproducer (as Charles H.Schneer)
- Mischa Bakaleinikoffcomposer (uncredited)
- Fred Jackman Jr.director of photography
- Danny B. Landreseditor (as Danny D. Landres)
- Leon Chooluckunit manager
- Gene Anderson Jr.assistant director
- J.S. Westmorelandsound (as Josh Westmoreland)
- Frank Bayessound editor (uncredited)
- Ernest Reichertsound editor (uncredited)
- Russ Kelleyspecial effects
- Ray Harryhausentechnical effects created by / special photographic effects (uncredited)
- Dale Van Sickelstunts (uncredited)
- Ray Harryhausenanimation effects (uncredited)
- Daniele Amfitheatrofcomposer: stock music (uncredited)
- Mario Castelnuovo-Tedescocomposer: stock music (uncredited)
- George Duningcomposer: stock music (uncredited)
- David Raksincomposer: stock music (uncredited)
- Miklós Rózsacomposer: stock music (uncredited)
- Hans J. Saltercomposer: stock music (uncredited)
- Leith Stevenscomposer: stock music (uncredited)
- Jack Ericksonproduction coordinator
Crew verified as complete
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