Test space rockets exploding at liftoff and increased reporting of UFO sightings culminate in a direct attempt by alien survivors of a dead, extra-galactic civilization to invade Earth from impervious flying saucers, using ray-weapons of mass destruction.
as Dr. Russell A. Marvin
as Carol Marvin
as Maj. Huglin
as Brig. Gen. John Hanley
as Vice Adm. Enright
as Gen. Edmunds
as Prof. Kanter
as Alien (voice)
as Alfred Cassidy
as Frank the garage man
as Motorcycle cop
as Air Intelligence Command Officer
as Military Officer at Experiment
as Officer/Civilian at Military Conference
as Major Kimberly
as Military Officer at Experiment (uncredited)
as Military Messenger (uncredited)
as Military Officer (uncredited)
as Dr. Alberts (uncredited)
as Military Official (uncredited)
as Alien (voice) (uncredited)
as Military Official (uncredited)
as Minor Role (uncredited)
as Military Official (uncredited)
as Sgt. Nash (uncredited)
as Cutting - Generator Technician (uncredited)
as Minor Role (uncredited)
as Worker in Control Tower (uncredited)
as Plane Passenger (uncredited)
as Military Officer at Experiment (uncredited)
as Radio Listener (archive footage) (uncredited)
as Plane Passenger (uncredited)
as Tank Commander (uncredited)
as Maj. Kimberly (uncredited)
as Man Crushed Beneath Wall (uncredited)
as Civilian Observing Saucer Attack (uncredited)
as Plane Passenger (uncredited)
as Alfred Cassidy (uncredited)
as Chinese Radio Listener (uncredited)
as Narrator (voice) (uncredited)
