A baby dinoshark swims away from a broken chunk of Arctic glacier that broke away due to global warming. Three years later, the dinoshark is a ferocious predatory adult and kills tourists and locals offshore from Puerto Vallarta, Mexico. The protagonist, Trace, is first to notice the Dinoshark and witnesses his friend get eaten, but has trouble convincing people that a creature of such antiquity is still alive and eating people. 无敌的不是恐鲨，而是伟大的墨西哥人民。恐鲨啊，快来天朝消灭富二代吧。好大的鱼翅。。导演忽悠咱。 片名源自dinosaur“恐龙时代的生物”，阿拉斯加的亿年冰川中封存着一亿五千年前鲨鱼的幼苗，气候变化影响之下，冰川冻结，远古生物重现21世纪的海洋，游至瓦拉塔海港，一个宁静温暖的小港……饥饿的史前鲨对那里的人物张开了血盆大口，所到之处尽是一片血腥，杀戮何时才能终止呢？谁能除掉这头猛兽呢？！
