A genetically mutated dog is stolen from the lab of mad scientist Dr. Jarret by news reporter/animal rights advocate Lori Tanner, who conceals it from the police in her home. The dog, Max, endowed with intelligence and other special abilities, is at first lovable, but also proves to be a ferocious, unstoppable killer. 人类的朋友，呵呵。 本片讲述的是杰瑞特博士想通过DNA的基因遗传改造，将狗主角麦斯变成更聪明、更灵活的护卫犬。可事与愿违，麦斯变得更具有攻击性，甚至变成更难对付的杀手。
