- Edmund H. Northscreen play by
- Harry Batesbased on a story by
Rest of cast listed alphabetically
- Patrick Aherne(uncredited)
- Larry Arnold(uncredited)
- Walter Bacon(uncredited)
- Rama Bai(uncredited)
- Oscar Blank(uncredited)
- Marshall Bradford(uncredited)
- Chet Brandenburg(uncredited)
- John Brown(uncredited)
- John Burton(uncredited)
- Wheaton Chambers(uncredited)
- Spencer Chan(uncredited)
- Jean Charney(uncredited)
- Beulah Christian(uncredited)
- John Close(uncredited)
- Louise Colombet(uncredited)
- James Conaty(uncredited)
- Frank Conroy(uncredited)
- Eric Corrie(uncredited)
- John Costello(uncredited)
- James Craven(uncredited)
- Marjorie Crossland(uncredited)
- Jack Daly(uncredited)
- Elmer Davis(uncredited)
- Lawrence Dobkin(uncredited)
- Jim Doyle(uncredited)
- Roy Engel(uncredited)
- Charles Evans(uncredited)
- Edith Evanson(uncredited)
- Michael Ferris(uncredited)
- Curt Furberg(uncredited)
- Bill Gentry(uncredited)
- Paul Gerrits(uncredited)
- Robert Haines(uncredited)
- Glenn Hardy(uncredited)
- Sam Harris(uncredited)
- Harry Harvey(uncredited)
- Al Haskell(uncredited)
- Gil Herman(uncredited)
- John Hiestand(uncredited)
- Michael Jeffers(uncredited)
- Michael Keep(uncredited)
- Kenneth Kendall(uncredited)
- Richard LaMarr(uncredited)
- Harry Lauter(uncredited)
- Freeman Lusk(uncredited)
- George Lynn(uncredited)
- Herbert Lytton(uncredited)
- Bert Madrid(uncredited)
- Mike Mahoney(uncredited)
- Sandee Marriott(uncredited)
- David McMahon(uncredited)
- Tyler McVey(uncredited)
- Millard Mitchell(uncredited)
- Ralph Montgomery(uncredited)
- Bruce Morgan(uncredited)
- Bill Neff(uncredited)
- Howard Negley(uncredited)
- Robert Osterloh(uncredited)
- Gayle Pace(uncredited)
- Ted Pearson(uncredited)
- 'Snub' Pollard(uncredited)
- Mike Ragan(uncredited)
- Gilman Rankin(uncredited)
- Anthony Redondo(uncredited)
- John M. Reed(uncredited)
- Bob Reeves(uncredited)
- Barry Regan(uncredited)
- Fay Roope(uncredited)
- Pola Russ(uncredited)
- James Seay(uncredited)
- Bernard Sell(uncredited)
- Charles Sherlock(uncredited)
- Peter Similuk(uncredited)
- Bob Simpson(uncredited)
- Marc Snow(uncredited)
- Olan Soule(uncredited)
- Kim Spalding(uncredited)
- Murray Steckler(uncredited)
- Harmon Stevens(uncredited)
- Glen Walters(uncredited)
- Harlan Warde(uncredited)
- Bill Welsh(voice) (uncredited)
- Stuart Whitman(uncredited)
- Guy Williams(uncredited)
- Wilson Wood(uncredited)
- Carleton Young(uncredited)
- Julian Blausteinproducer (produced by)
- Bernard Herrmanncomposer (music)
- William Reynoldsfilm editor
- Addison Hehrart director (art direction)
- Lyle R. Wheelerart director (as Lyle Wheeler) (art direction)
- Claude E. Carpenterset decorator (as Claude Carpenter) (set decorations)
- Thomas Littleset decorator (set decorations)
- Clinton Sandeencostume designer (uncredited)
- Lynn F. Reynoldsmakeup artist (uncredited)
- Gene Bryantunit manager (uncredited)
- Darryl F. Zanuckexecutive in charge of production (uncredited)
- Richard Del Ruthsecond assistant director (uncredited)
- Stan Houghassistant director: second unit (uncredited)
- Bert Leedssecond unit director (uncredited)
- Arthur Luekerfirst assistant director (uncredited)
- Arthur von Kirbachsound (as Arthur L. Kirbach)
- Melbourne A. Arnoldrobot builder (uncredited)
- Hal Millarspecial effects (uncredited)
- Fred Sersenspecial photographic effects
- L.B. Abbotteffects team (uncredited)
- Lyman Hallowellvisual effects editor (uncredited)
- Ray Kelloggeffects team (uncredited)
- Earl Gilbertrigging electrician (uncredited)
- Perkins Baileycostume designer: Klaatu's
- Charles Le Mairewardrobe director
- Sam Bensonwardrobe (uncredited)
- Ed Wynigearwardrobe (uncredited)
- Orven Schanzerfirst assistant editor (uncredited)
- Bernard Herrmannorchestrator (uncredited)
- Samuel Hoffmanmusician: theremin (uncredited)
- Paul Shuremusician: theremin (uncredited)
- Samuel Herricktechnical advisor (uncredited)
- Anthony Jowittdialogue director (uncredited)
- Steve Pritkostand-in: Michael Rennie (uncredited)
- Clifford Salesdouble: Billy Gray (uncredited)
Crew verified as complete
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