Commando Cody (George Wallace) is a civilian researcher and inventor with a number of employees. He uses a streamlined helmet and a sonic-powered rocket backpack attached to a leather flying jacket. Cody also uses a rocket ship capable of reaching the Moon. When the U. S. finds itself under attack from a mysterious force that can wipe out entire military bases and industrial complexes, Cody surmises (correctly) that the Earth is coming under attack from our own Moon. He then flies his rocket ship there and confronts the Moon's dictator, Retik (Roy Barcroft), who boldly announces his plans to both conquer Earth and then move the Moon's entire population here using spaceships.
On Earth, Cody battles an elusive lunar warrior named Krog (Peter Brocco) and his gang of human henchmen, hired to steal and stockpile various supplies for the coming invasion.