五年的追逐化为泡影，随着X档案的关闭，福克斯·穆德（大卫·杜楚尼 David Duchovny 饰）和丹娜·斯科莉（吉莲·安德森 Gillian Anderson 饰）被迫调任处理一些平常的案件。某天，美国得州达拉斯市发生一起爆炸案。虽然穆德和斯科莉极力疏散写字楼内的人群，但爆炸还是夺取了4名无辜者的性命，他们也因此受到上级的指摘。然而事后不久，穆德便得知4名牺牲者早在爆炸之前便已死亡，所谓爆炸案不过是某个神秘部门为了掩盖证据而实施的骗局。该部门据说多年来一直从事外星人的研究，并且他们的研究足以导致人类的毁灭。两名搭档决定彻查此事，但是神秘且难以抗拒的力量无时无刻不在阻挠他们追寻真相的脚步……
　　本片为同名美剧的第一部剧场版。

　　Andy is a writer for newspaper classifieds who has been bouncing from relationship-to-relationship since sixth grade. Throughout the film, he loses custody of his dog when his girlfriend, Cheryl, breaks up with him for another man. Andy then meets Lorna, a children's TV show host, but she is too obsessed with her own dog to commit to a relationship with Andy. She's also still smiting because her boyfriend Trevor, left her for Andy's ex, Cheryl.
　　Andy also has a fling with another woman, Keiran. Meanwhile, Cheryl takes Andy's dog to a psychiatrist, who tells her that her promiscuity is traumatizing the dog.