 Copper miners in the tundras of Lapland discover a frozen piece of reptilian tail belonging to some unknown prehistoric creature. Taking the specimen to an aquarium in Copenhagen, Professor Martens (Asbjorn Andersen) gets more than he bargained for when the tail regenerates into a giant, acid spitting monster that terrorizes the country. The Danish military, led by U.N.-appointed American general Mark Grayson (Carl Ottosen) attempts to hunt down the monster and destroy it, only to realize that blowing the thing up will create hundreds of little creatures.