Lee Van Cleef stars as John Peter McAllister, who as a reverend master of the Ninja warrior society, deserts the order the order to search for his missing daughter in the U.S.

In the 17th century, an order of monks in Italy capture and entomb a demon that has possessed a member of their group. 400 years later, school teacher Elizabeth Magrino visits the monastery in order to do some research. What she and the current monks do not realize is that the evil hiding within the catacombs has unwittingly been released.

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.

Lee Van Cleef and Timoty Van Patten are back in this "sequel" to their last "movie" about a ninja and his apprentice battling evil wherever they go. In reality, it's two episodes of failed TV show 'The Master' repackaged as a movie. Also featured in an episode of Mystery Science Theater 3000.