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Directed by | |||
| Fred F. Sears | |||
Writing credits(WGA) | ||
| Donald E. Keyhoe | (book "Flying Saucers from Outer Space") (as Major Donald E. Keyhoe) | |
| Curt Siodmak | (screen story) | |
| George Worthing Yates | (screenplay) & | |
| Bernard Gordon | (screenplay) originally as Raymond T. Marcus | |
| Hugh Marlowe | ... | Dr. Russell A. Marvin | |
| Joan Taylor | ... | Carol Marvin | |
| Donald Curtis | ... | Maj. Huglin, Liason Officer | |
| Morris Ankrum | ... | Brig. Gen. John Hanley | |
| John Zaremba | ... | Prof. Kanter | |
| Thomas Browne Henry | ... | Vice Adm. Enright (as Tom Browne Henry) | |
| Grandon Rhodes | ... | Gen. Edmunds | |
| Larry J. Blake | ... | Motorcycle cop (as Larry Blake) | |
| rest of cast listed alphabetically: | |||
| Fred Aldrich | ... | Airplane Passenger / Officer in Sighting Montage / Man in Saucer Attack (uncredited) | |
| Holly Bane | ... | Bit Role (uncredited) (unconfirmed) | |
| Nicky Blair | ... | Military Officer at Experiment (uncredited) | |
| Charles Evans | ... | Dr. Alberts (uncredited) | |
| Paul Frees | ... | Alien Voice (voice) (uncredited) | |
| Duke Green | ... | Bit Role (uncredited) | |
| Clark Howat | ... | Sgt. Nash (uncredited) | |
| Harry Lauter | ... | Cutting, Generator technician (uncredited) | |
| Don Marlowe | ... | Bit Role (uncredited) (unconfirmed) | |
| Forbes Murray | ... | Military Officer at Experiment (uncredited) | |
| Alan Reynolds | ... | Maj. Kimberly (uncredited) | |
| Bert Stevens | ... | Officer in UFO Sighting Montage (uncredited) | |
| Arthur Tovey | ... | Officer / Civilian at Military Conference (uncredited) | |
| Dale Van Sickel | ... | Crushed Beneath Wall (uncredited) | |
| Frank Wilcox | ... | Alfred Cassidy (uncredited) | |
| Beal Wong | ... | Radio Listener in China (uncredited) | |
| William Woodson | ... | Off-Screen Narrator (uncredited) (unconfirmed) | |
Produced by | |||
| Sam Katzman | .... | executive producer | |
| Charles H. Schneer | .... | producer | |
Original Music by | |||
| Mischa Bakaleinikoff | (uncredited) | ||
Cinematography by | |||
| Fred Jackman Jr. | |||
Film Editing by | |||
| Danny B. Landres | (as Danny D. Landres) | ||
Art Direction by | |||
| Paul Palmentola | |||
Set Decoration by | |||
| Sidney Clifford | |||
Production Management | |||
| Leon Chooluck | .... | unit manager | |
Second Unit Director or Assistant Director | |||
| Gene Anderson Jr. | .... | assistant director (uncredited) | |
Sound Department | |||
| J.S. Westmoreland | .... | sound (as Josh Westmoreland) | |
Special Effects by | |||
| Russ Kelley | .... | special effects | |
| Ray Harryhausen | .... | special effects (uncredited) | |
Stunts | |||
| Dale Van Sickel | .... | stunts (uncredited) | |
Animation Department | |||
| Ray Harryhausen | .... | special photographic and animation effects | |
Music Department | |||
| Mischa Bakaleinikoff | .... | conductor | |
| Daniele Amfitheatrof | .... | composer: stock music (uncredited) | |
| Mario Castelnuovo-Tedesco | .... | composer: stock music (uncredited) | |
| George Duning | .... | composer: stock music (uncredited) | |
| David Raksin | .... | composer: stock music (uncredited) | |
| Miklós Rózsa | .... | composer: stock music (uncredited) | |
| Hans J. Salter | .... | composer: stock music (uncredited) | |
| Leith Stevens | .... | composer: stock music (uncredited) | |
Other crew | |||
| Jack Erickson | .... | production coordinator | |
| Company credits | Technical specifications | Main details |