Aliens, contacting scientist Adam Penner, inform him that they have been on the moon for twenty thousand years, undetected due to their invisibility, and have now decided to annihilate humanity unless all the nations of earth surrender immediately. Sequestered in an impregnable laboratory trying to find the aliens' weakness, Penner, his daughter, a no-nonsense army major and a squeamish scientist are attacked from outside by the aliens, who have occupied the bodies of the recently deceased.
John Agar
as Maj. Bruce Jay
Jean Byron
as Phyllis Penner
Philip Tonge
as Dr. Adam Penner
Robert Hutton
as Dr. John Lamont
John Carradine
as Dr. Karol Noymann
Hal Torey
as The Farmer
Paul Langton
as Lt. Gen. Stone
Eden Hartford
as WAAF Secretary
Jack Kenney
as Car Crash Victim
John Roy
as Game Spectator
Dick Cherney
as Zombie
George Bruggeman
as Technician
