- Alford Van Ronkelwritten for the screen by (as Rip Van Ronkel) &
- Robert A. Heinleinwritten for the screen by and
- James O'Hanlonwritten for the screen by
- Robert A. Heinleinfrom a novel by
Rest of cast listed alphabetically
- Franklyn Farnum(uncredited)
- Jack Gargan(uncredited)
- Everett Glass(uncredited)
- Knox Manning(uncredited)
- Cosmo Sardo(uncredited)
- Grace Stafford(voice) (uncredited)
- Bert Stevens(uncredited)
- George Palproducer
- Lionel Lindoncinematographer (photographed by)
- Duke Goldstonefilm editor
- Webster C. Phillipsmakeup artist (as Webster Phillips)
- Martin Eisenbergproduction supervisor
- Harold Godsoeassistant director
- Chesley Bonestelltechnical advisor of astronomical art
- Walter Bjorneposter artist: Sweden (uncredited)
- Otto Hempelposter artist: West Germany (uncredited)
- William H. Lynchsound (as William Lynch)
- Lee Zavitzspecial effects
- Walter Lantzcartoon sequences / animation producer (uncredited) / producer (uncredited)
- Ray Abramsanimator (uncredited)
- Fred Brunishbackground artist (uncredited)
- Laverne Hardinganimator (uncredited)
- Fred Madisonanimator (uncredited)
- Ernie Nordlilayout artist (uncredited)
- Don Pattersonanimator (uncredited) / director (uncredited)
- Paul J. Smithanimator (uncredited)
- Don Towsleyanimator (uncredited)
- Robert Browercolor consultant: Technicolor
- Dave Torbettorchestrator (as David Torbet)
- Clarence Wheelercomposer: animation sequence (uncredited)
- John S. Abbotttechnical supervisor
- Robert A. Heinleintechnical advisor
- Miles E. Piketechnician
- Robert S. Richardsontechnical advisor
- Dale Tholentechnician
Crew verified as complete
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