Reptilicus

Copper miners in the tundra 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 U.S. General Mark Grayson (Carl Ottosen) attempts to hunt down the monster and destroy it, only to realize that blowing it up will create hundreds of monsters.