Deep in the desert, a rural American family is forced to endure a night of inter-dimensional, extra terrestrial terror when a UFO appears over their home.

A man who runs an apartment house for women is the demented son of a Nazi surgeon who has the house equipped with secret passageways, hidden rooms and torture and murder devices.

In New York City sometime in the near future, Z, the evil chairman of the Inteltrax Corporation, has taken a small army of cyborgs designed to perform hazardous tasks and altered them to kill humans for pleasure. The inventor of the cyborgs, Dr. Paul Haynes, is held captive, and his sister Darla seeks the aid of Matt Riker, an expert in high-tech weaponry and martial arts.

American soldiers, led by The Sarge, are stuck behind Nazi enemy lines. As they make their way across the Italian countryside, they come across an alien spaceship that has crash-landed in the woods. The alien pilot is dead, but one of the ship's passengers is on the loose. As the GIs hunt down the alien by splitting into smaller groups, they're not only tracked by the Nazis, but also a whole host of other aliens come to save their stranded party.