Director/a
Fred F. Sears
DIRECTOR/A
Reparto (por orden de créditos)
Hugh Marlowe
Dr. Russell A. Marvin
Joan Taylor
Carol Marvin
Donald Curtis
Maj. Huglin
Morris Ankrum
Maj. Gen. John Hanley
John Zaremba
Prof. Kanter
Thomas Browne Henry
Vice Adm. Enright
Grandon Rhodes
Gen. Edmunds
Larry J. Blake
Motorcycle Cop
Fred Aldrich
Airplane Passengeruncredited
Nicky Blair
Military Officer at Experimentuncredited
Jimmy Cross
Military Messengeruncredited
Jack Deery
Military Officeruncredited
Charles Evans
Dr. Albertsuncredited
Raoul Freeman
Military Officialuncredited
Paul Frees
Alienuncredited,voice
James Gonzalez
Duke Green
Minor Roleuncredited
Ed Haskett
Clark Howat
Sgt. Nashuncredited
Harry Lauter
Cutting - Generator Technicianuncredited
Don Marlowe
William Meader
Worker in Control Toweruncredited
Sol Murgi
Plane Passengeruncredited
Forbes Murray
William J. O'Brien
Radio Listeneruncredited,archiveFootage
Murray Pollack
Mike Ragan
Tank Commanderuncredited
Alan Reynolds
Maj. Kimberlyuncredited
Bert Stevens
Air Intelligence Command Officeruncredited
Arthur Tovey
Officeruncredited
Dale Van Sickel
Man Crushed Beneath Walluncredited
Guy Way
Civilian Observing Saucer Attackuncredited
Bob Whitney
Frank Wilcox
Alfred Cassidyuncredited
Beal Wong
Chinese Radio Listeneruncredited
William Woodson
Narratoruncredited,voice