地球上一直存在着一个黑暗的地下世界。那里,两大种族――吸血鬼和狼人――在斗得你死我活,每一方都以消灭对方种族为最终目标。 一次,吸血鬼族的“月神”西丽妮(凯特•贝金赛尔 Kate Beckinsale 饰)在追杀几个落败的狼人时发现,狼人正在密谋绑架人类的一名医生麦克尔 (斯科特•斯比德曼 Scott Speedman 饰)。心知狼人必有所图,西丽妮独自前往狼窝查探。不料中了狼人的埋伏,身负重伤之际幸得麦克尔相救。在麦克尔送西丽妮回吸血鬼营地的途中,他意外被一只狼人咬伤了,由此揭开了麦克尔的身世之谜和狼人的阴谋……A war has been raging between the Vampires and Lycan for centuries, Selene (Beckinsale) is a death dealer, assigned to hunt down and eradicate the last of the Lycan. When she comes across Michael Corvin (Speedman) who holds the key to end the war she must decide where her allegiances will lie.