After conducting secret biological experiments for military purposes, a brilliant scientist becomes infected with a deadly virus created during World War II. He transforms into a monstrous creature that must feed on human blood to survive. The terrifying monster embarks on a bloody spree of horrific crimes, after which it takes refuge in the city’s dark sewers. After a quarantine is declared, one of the best secret agents is sent to the city, tasked not only with a scientific mission but also with preventing the spread of the epidemic and the destruction of the city…