Three  years after having survived the events of the first film, Michelle (Lexi Dripps) is now in college. However, she is still plagued with the questions of what truly happened after what she believ...

　　第三次世界大战在1998年爆发后，地球已成为了一片废墟，几名战后幸存者过着狼狈的逃亡日子。在一个偶然的机会下，他们找到了被政府遗弃的研究设施，并以那里当做自己的地下基地，然而他们并不知道，和他们一起生活的还有一只突变的可怕怪兽，它的唾液可以将人腐蚀致死。幸存者们面临前所未有的困境……...