A black alien meteor lands in small desert town of San Angelo, it is first found by one of the local geologists and takes it into the lab to try and find out what kind of material it is. The next day the geologists is discovered petrified, by his fellow geologists Dave Miller, along with larger amounts of the black rock all over the place. Dave soon makes a horrifying discovery that when the black meteor pieces touches any kind of liquid it multiplies to get amounts and heights. The rock continues to raise up and fall making a path of destruction hurting the town and even worse a rain storm is also about to hit the town. It's up to Dave, various experts and the town residents to stop the rock before it can spread across the Earth.