Nero's reign. The invasion of Parthia has been a fiasco. Two Roman legions have been brought to a stand still in the snowy mountains of Armenia, and the men are dying slowly in the cold. The rest of the Roman army is in Syria, only two weeks march away but the mountains swarm with Parthian patrols. Noreno, a half-Roman, is entrusted the mission of crossing the mountains to ask for help. However, he might not be the best option, he's an expert runner, but he despises Rome.
衛(wèi)斯理（劉華），一個(gè)從事蹤、調(diào)查神秘事的男人，是聯(lián)合外星生物分析局特別成員，處理球上一切和外星物有關(guān)的事件。次，衛(wèi)斯理在古店參觀一塊奇異藍(lán)色人骨時(shí)，遇了少時(shí)曾有一面緣的藍(lán)血人-- 擁有藍(lán)色血液的星人，「她」的字叫方天涯（關(guān)琳），外表就和般美女無異。衛(wèi)理正想留住方天，這時(shí)附近卻發(fā)了一宗外星生物襲事件，美國的星生物調(diào)查機(jī)構(gòu)--隸屬FBI的Double X Unit小組 奉命到場(chǎng)，由隊(duì)中英白素（舒淇）白奇?zhèn)ィ◤堃珦P(yáng)兄妹領(lǐng)隊(duì)。白氏妹帶領(lǐng)著X組精銳部隊(duì)進(jìn)入事發(fā)大，與具有A級(jí)戰(zhàn)斗力的外星生物交。衛(wèi)斯理也前來陣，無奈，不敵大的對(duì)手，身受傷，而方天涯亦此時(shí)再次現(xiàn)身，奇異的力量救了斯理，殺死了強(qiáng)的外星怪物?
