美国核子动能研究学家将核研究后的废料排到大河中流入湖泊中，核废料竟然基因突変滋生了一条锐齿凶猛又巨大的可怕的绿色鳄鱼，它神出鬼没不时的来袭击在湖泊岸边活动的人们。新闻系女生罗拉与警察埃迪都亲眼目睹了鳄鱼的出现。但是许多的人们并不相信他们的话，这时越来越多的人在湖边离奇的失踪了……

A nuclear leak mutates the fish in the lake next to the local university. Journalism student, Lola Dent sees this story as an opportunity to make the honor list. She uses her wiles to convince a rookie harbor police officer to help her crack the case.