这是一场浩劫，人类最可怕的恶梦。影片讲述了一架UFO坠落在森林里，UFO舱门打开，本想爬出的外星生物刚伸出手臂已力竭身死，这时水塘浮出了刚从幼虫蜕变成蚊蚋，飞落在死掉的外星生物手臂上吸食血液从而突变，长成六尺大的巨蚊，成群结队外出，见人就螫，吸乾全身的血水，森林中的露营游客、居民、农家、巡逻队无一幸免，有一小撮人由一位气象学博士带领，他们为了生存力拼巨蚊，也阻止巨蚊繁衍，为了人类的存亡，一场殊死的人蚊之战，爆发性的展开。

After the death of his brother, Mick travels to America to seek Justice. Wrongly convicted of extortion and attempted murder, Mick is sent to Pleasant Hill Penitentiary's notorious death block 13. Seething with revenge after discovering the truth qigou.cc behind his brother's death, Mick's rage ignites an explosive riot as he makes a daring escape from death block 13.