Eric Alden Man (uncredited)
Carolyn Jones Blonde Party Guest (uncredited)
Arthur Tovey Party Guest (uncredited)
Pierre Cressoy Frenchman (uncredited)
H. G. Wells Novel
Gene Barry Clayton Forrester
Henry Brandon Cop at Crash Site
Dale Van Sickel Looter (uncredited), Stunts
Dorothy Vernon Elderly Woman at Square Dance (uncredited)
Cedric Hardwicke Commentary (voice)
William Phipps Wash Perry
Paul Birch Alonzo Hogue (uncredited)
Paul Frees Second Radio Reporter / Opening Announcer
Russ Conway Rev. Bethany (uncredited)
Fred Graham Looter (uncredited), Stunts
George Bruggeman Soldier (uncredited), Stunts
Michael Jeffers Worker Listening to Radio (uncredited)
Tex Holden Man in Church (uncredited), Stunts
Lee Miller Reporter (uncredited)
Herman Hack Worker Listening to Radio (uncredited), Stunts
Joel Marston Military Policeman in Jeep (uncredited)
William Meader P.E. Official (uncredited)
Ned Glass Well-Dressed Looter (uncredited)
Edith Head Costume Design
Teru Shimada Japanese Diplomat (uncredited)
Loren L. Ryder Sound Director
Ann Robinson Sylvia Van Buren
Bert Stevens Man in Church (uncredited)
Jack Stoney Looter (uncredited), Stunts
Hal Pereira Art Direction
Charles Stewart Marine Captain (uncredited)
Paul K. Lerpae Visual Effects
Charles Morton Worker Listening to Radio (uncredited), Stunts
Wally Westmore Makeup Supervisor
Helen Dickson Woman in Church (uncredited)
Russ Bender Dr. Carmichael (uncredited)
Dick Johnstone Man in Church (uncredited)
Byron Haskin Director
Peter Adams Pine Summit Fire Watcher (uncredited)
Cecil B. DeMille Executive Producer
Ralph Dumke Buck Monahan (uncredited)
Jack Kruschen Salvatore
Herbert Lytton Chief of Staff (uncredited)
Anthony Warde Military Police Driver (uncredited)
James Seay Air Force Bomber Pilot (uncredited)
Les Tremayne General Mann
A. Edward Sutherland Special Effects
Mike Mahoney Townsman (uncredited)
Cora Shannon Old Woman (uncredited)
Robert Cornthwaite Dr. Pryor
Jerry James Reporter (uncredited)
Harry Lindgren Sound Recordist
Douglas Henderson Staff Sergeant (uncredited)
Edgar Barrier Prof. McPherson (uncredited)
Fred Zendar Marine Lieutenant (uncredited), Stunts
George Pal Bum #1 Listening to Radio (uncredited), Producer
Wilbur Mack Official (uncredited)
Chet Brandenburg Man in Church (uncredited), Stunts
Walter Sande Sheriff Bogany (uncredited)
Mathew McCue Man in Church (uncredited)
Lewis Martin Matthew Collins
Alvy Moore Zippy (uncredited)
Jack Gordon Man in Church (uncredited)
Leith Stevens Original Music Composer
Sandro Giglio Dr. Bilderbeck
Michael D. Moore Assistant Director
Robert Rockwell Forest Ranger at Crash Site (uncredited)
Ann Codee Dr. Duprey (uncredited)
Nora Bush Woman in Church (uncredited)
Charles Gemora Martian (uncredited), Costumer
Allen D. Sewall Man in Church (uncredited)
Dick Cherney Looter (uncredited)