AllMovie

A series of launches at the US government's new Cape Canaveral base go awry, and the head of the missile program, Dr. Von Hoften (Billy Greene), is at a loss to explain the failures. Meanwhile, the military commander, General Hollister (Chuck Howard), has nothing but a few vague clues of something amiss. But then a sentry puts a whole clip of bullets into a fleeing figure, who also leaves behind his arm while escaping the soldier's guard dogs -- all of it adds up to . . . what? A young scientist, Tom Wright (Scott Peters) and his girlfriend Sally Markham (Linda Connell) -- the niece of the program head -- follow a mysterious radio transmission and find their way to a newly carved out cave where a pair of alien scientists, Hauron (Jason Johnson and Nadja (Katherine Victor), have hidden their laboratory, all as part of a plan to delay Earth's rocket research and pave the way for an invasion. Tom tries to give warning to the authorities, but can he persuade them of the danger in time to save the world?