| Person | Type | Job | Role(s) |
|---|---|---|---|
 Addison Hehr | Crew | Art | Art Direction |
 Ben Nye | Crew | Costume & Make-Up | Makeup Artist |
 Bernard Herrmann | Crew | Sound | Original Music Composer |
Charles LeMaire | Crew | Costume & Make-Up | Wardrobe Master |
Claude E. Carpenter | Crew | Art | Set Decoration |
 Edmund H. North | Crew | Writing | Screenplay |
Fred Sersen | Crew | Crew | Special Effects |
Julian Blaustein | Crew | Production | Producer |
Leo Tover | Crew | Camera | Director of Photography |
 Lyle R. Wheeler | Crew | Art | Art Direction |
Perkins Bailey | Crew | Costume & Make-Up | Costume Design |
 Robert Wise | Crew | Directing | Director |
Thomas Little | Crew | Art | Set Decoration |
 Travilla | Crew | Costume & Make-Up | Costume Design |
William Reynolds | Crew | Editing | Editor |
Harry Bates | Crew | Writing | Original Story |
 Bess Flowers | Cast | Actress | Lady Outside Jewelry Store |
Bill Welsh | Cast | Radio Announcer (voice) | |
 Billy Gray | Cast | Actor | Bobby Benson |
 Carleton Young | Cast | Actor | Zone Five Lieutenant Colonel |
 Dorothy Neumann | Cast | Actress | Margaret, Tom's secretary |
Drew Pearson | Cast | Drew Pearson | |
 Edith Evanson | Cast | Actress | Mrs. Crockett, landlady |
Elmer Davis | Cast | Elmer Davis | |
 Frances Bavier | Cast | Actress | Mrs. Barley, boarder |
 Frank Conroy | Cast | Actor | Mr. Harley, Secretary to the President |
 Freeman Lusk | Cast | Actor | General Cutler |
Gabriel Heatter | Cast | Gabriel Heatter (voice) | |
 George Lynn | Cast | Actor | Conference Colonel Ryder |
Grady Galloway | Cast | Radar Operator | |
H.V. Kaltenborn | Cast | H. V. Kaltenborn | |
 Harry Harvey | Cast | Actor | The Cab Driver |
 Harry Lauter | Cast | Actor | Lieutenant in Charge of Landing Site |
 House Peters Jr. | Cast | Actor | M.P. Captain at Barnhardt's |
 Hugh Marlowe | Cast | Actor | Tom Stevens |
 James Seay | Cast | Actor | Government Man |
 John Brown | Cast | Actor | George Barley, boarder |
John Burton | Cast | Actor | British Radio Announcer |
 Lock Martin | Cast | Actor | Gort |
Marjorie Crossland | Cast | Actress | Hilda, Barnhart's secretary |
 Michael Rennie | Cast | Actor | Klaatu, alias Mr. Carpenter |
 Olan Soule | Cast | Actor | Mr. Krull, boarder |
 Patricia Neal | Cast | Actress | Helen Benson |
 Robert Osterloh | Cast | Actor | Army Examining Doctor |
 Sam Jaffe | Cast | Actor | Prof. Jacob Barnhardt |
 Stuart Whitman | Cast | Actor | Sentry (scene deleted) |
 Tyler McVey | Cast | Actor | Brady |
 Wheaton Chambers | Cast | Actor | Mr. Bleeker, jeweller |
Sammy Ogg | Cast | Actor | Sammy, boy witness |
John Barton | Cast | Actor | British Newscaster |
Rama Bai | Cast | Actress | Scientific Delegate |
James Doyle | Cast | Army Dr. White | |
Larry Dobkin | Cast | Balding Army Doctor | |
Glenn Hardy | Cast | Radio Interviewer at Landing Site | |
Hassan Khayyam | Cast | Indian Newscaster | |
| Person | Type | Job | Role(s) |
