A team of scientists, led by Dr. Irwin Burns, test an experimental drug that increases the aggression in animals and humans. When his lab explodes during an accident, the giant mutated snake they created, a hybrid of a King Cobra and a diamondback, escapes and starts killing people in the nearby town. Although this presents the typical animal on the loose scenario the script is engaging, the effects by the Chiodo brothers are excellent and Pat Morita gives one of his best performances to date as a snake wrangler.