A disease carried by common cockroaches is killing Manhattan children. In an effort to stop the epidemic an entomologist, Susan Tyler, creates a mutant breed of insect that secretes a fluid to kill the roaches. This mutant breed was engineered to die after one generation, but three years later Susan finds out that the species has survived and evolved into a large, gruesome monster that can mimic human form.

The planned reburial of a village elder goes awry as the corpse resurrects into a hopping, bloodthirsty vampire, threatening mankind. Therefore, a Taoist Priest and his two disciples attempt to stop the terror.

The plot involves patriots during the Sung Dynasty and their attempts to rescue a kidnapped prince from Ching troops who have invaded the north of China. The patriots are led by Ti Lung who recruits a mysterious but seemingly superhuman fighter played by David Chiang to find a way to cross a perilous bridge to enter an impregnable fortress to locate and rescue the imprisoned prince. The big confrontation at the end involves trickery on the part of the heroes and the self-sacrifice of one of their number as David, who is not known to the enemy, brings in Ti as his `prisoner’ to turn over to the Chings, as a way of gaining entrance. Then he cuts Ti’s bonds and all hell breaks loose.