In 2030 during World War III in which a small group of survivors make it into a bunker. Two years later they have to exit to find new supplies, but they are greeted by dinosaur predators.。电影讲述了在未来,温室效应加剧,环境恶化,人们被迫建造、迁居地下城。科学家们苦心研制气温平衡剂,建造地底列车,希望能带领大家返回地表重建家园。然而在排放计划当天,变异巨蜥空降肆虐,毒气蔓延,灾难降临。
幸存者们在列车工程师王戈的带领下,踏上绝境逃生之旅。。阿南是一名偷车高手,因一次失手,遭警方追捕入狱。出狱后阿南决心重新做人。阿忠苦苦哀求,南再度出山。在交易中遭警察截查,南再次入狱。在狱中阿南知妻子被阿忠强暴而坠楼身亡,便同意警方要求做卧底,潜入匪帮。在阿南协助下,成功将匪头拘捕,南从此远走他乡。。