Plot Summary:After an African dinosaur ancestor of the crocodile is found, Dr. Campbell uses its DNA to create prototypes at Paula Kennedy's Genetic Research Co. (Gereco) lab. However one must be put down after killing someone, another escapes and the information is kept from sheriff Harper. His daughter, county dog catcher Diane Harper, helps her ex (welding artist Tom Banning) with his kid brother Michael's beloved dog. They bump into Campbell and discover the dinocroc is growing, having escaped down a tunnel. Although Gereco hires Australian crocodile specialist and intrepid hunter, Richard 'Dick' Sydney, the beast proves impervious to bullets, so the body count rises alarming.
黑暗的湖水中出现史前巨鳄,是鳄鱼与恐龙的结合体,这种生物不仅有着鳄鱼的血盆大口,更能像霸王龙一样用后肢在陆地上行走。科学家成立实验室对其进行研究并计划操控它。不幸的是它摆脱了控制并在实验室里大开杀戒。这只在湖中沉睡多年的恐龙时代的幸存者充满了贪婪的渴望,人类成为它果腹的美餐。一时间,附近居民人人自危。