| Person | Type | Job | Role(s) |
|---|---|---|---|
 Bernard Gordon | Crew | Writing | Screenplay |
 Charles H. Schneer | Crew | Production | Producer |
 Curt Siodmak | Crew | Writing | Screenstory |
Danny B. Landres | Crew | Editing | Editor |
Donald E. Keyhoe | Crew | Writing | Novel |
 Fred F. Sears | Crew | Directing | Director |
Fred Jackman Jr. | Crew | Camera | Director of Photography |
Gene Anderson Jr. | Crew | Directing | Assistant Director |
 George Worthing Yates | Crew | Writing | Screenplay |
J.S. Westmoreland | Crew | Sound | Sound |
Jack Erickson | Crew | Production | Production Coordinator |
Leon Chooluck | Crew | Production | Unit Manager |
Paul Palmentola | Crew | Art | Art Direction |
 Ray Harryhausen | Crew | Visual Effects | Visual Effects |
Sam Katzman | Crew | Production | Executive Producer |
Sidney Clifford | Crew | Art | Set Decoration |
Russ Kelley | Crew | Crew | Special Effects |
 Arthur Tovey | Cast | Actor | Officer/Civilian at Military Conference |
Beal Wong | Cast | Actor | Chinese Radio Listener (uncredited) |
 Bert Stevens | Cast | Actor | Air Intelligence Command Officer |
Bob Whitney | Cast | Actor | Plane Passenger (uncredited) |
 Charles Evans | Cast | Actor | Dr. Alberts (uncredited) |
 Clark Howat | Cast | Actor | Sgt. Nash (uncredited) |
 Dale Van Sickel | Cast | Actor | Man Crushed Beneath Wall (uncredited) |
 Donald Curtis | Cast | Actor | Maj. Huglin |
Duke Green | Cast | Actor | Minor Role (uncredited) |
Ed Haskett | Cast | Actor | Military Official (uncredited) |
 Forbes Murray | Cast | Actor | Military Officer at Experiment (uncredited) |
 Frank Wilcox | Cast | Actor | Alfred Cassidy (uncredited) |
 Grandon Rhodes | Cast | Actor | Gen. Edmunds |
 Guy Way | Cast | Actor | Civilian Observing Saucer Attack (uncredited) |
 Harry Lauter | Cast | Actor | Cutting - Generator Technician (uncredited) |
 Hugh Marlowe | Cast | Actor | Dr. Russell A. Marvin |
Jack Deery | Cast | Actor | Military Officer (uncredited) |
James Gonzalez | Cast | Actor | Military Official (uncredited) |
Jimmy Cross | Cast | Actor | Military Messenger (uncredited) |
 Joan Taylor | Cast | Actress | Carol Marvin |
 John Zaremba | Cast | Actor | Prof. Kanter |
 Larry J. Blake | Cast | Actor | Motorcycle cop |
 Morris Ankrum | Cast | Actor | Brig. Gen. John Hanley |
 Nicky Blair | Cast | Actor | Military Officer at Experiment (uncredited) |
 Paul Frees | Cast | Actor | Alien (voice) (uncredited) |
Raoul Freeman | Cast | Military Official (uncredited) | |
 Thomas Browne Henry | Cast | Actor | Vice Adm. Enright |
William J. O'Brien | Cast | Actor | Radio Listener (archive footage) (uncredited) |
William Meader | Cast | Actor | Worker in Control Tower (uncredited) |
 Sydney Mason | Cast | Actor | Frank the garage man |
 Mike Ragan | Cast | Actor | Tank Commander (uncredited) |
 Sol Murgi | Cast | Plane Passenger (uncredited) | |
 William Woodson | Cast | Actor | Narrator (voice) (uncredited) |
Alan Reynolds | Cast | Actor | Maj. Kimberly (uncredited) |
Don Marlowe | Cast | Minor Role (uncredited) | |
Murray Pollack | Cast | Actor | Plane Passenger (uncredited) |
Alan Wells | Cast | Actor | Major Kimberly |
| Person | Type | Job | Role(s) |
