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　　一名医生因一连串令人震惊的凶恶案而入监服刑，他忠心的妻子打算模仿同样的杀人手法作案，借以证明他的清白。

　　故事发生在某个毗邻原始森林的小镇，一家伐木公司正在林中作业，这时白雪飘然落下，作业暂时停止，然而随即便发生了残酷血腥的事件。与此同时，警长保罗·希尔德（凯文·杜兰德 Kevin Durand 饰）和新来的搭档唐尼刚刚敷衍完几个报警事件，随后驱车来到前妻苏珊（Bianca Kajlich 饰）的家中，接走儿子亚当（Ethan Khusidman 饰）回自家居住。一夜无事，次日一早，保罗在门口发现硕大的脚印，而且脚印遍布小镇主干道，一直延伸到森林深处。巨大的脚印在小镇闹得人心惶惶，保罗起初绝不相信妖精怪物一类的传说，但是恐怖血腥的事件接二连三发生，让小镇陷入前所未有的恐慌之中。　　危机渐次逼近……

　　The main character is Dr. Max Holst, a successful neurosurgeon. One day an intense little man named Steinmetz shows up, who has the real ability to create objects out of thin air, using only his mind. As no one believes him at first, he is held at a ward for mental patients, but manifests the key to his door and escapes. As he has a special interest in Dr. Holst, Steinmetz subsequently invites Holst to his large mansion, which is full of expensive paintings and sculptures, and proves to him that he can in fact materialise objects. Steinmetz’s abilities are evolving by leaps and bounds, and is progressing from being able to create objects only to being able to create living things. His ultimate ambition is to be able to create a human being. He tells Dr. Holst that if he will only perform a certain brain operation on him, Steinmetz will become able to attain his goal. He’s got all the necessary equipment set up in his basement. Dr. Holst, however, is too spooked by the whole thing to agree to this mad scheme, and refuses. Steinmetz then sets about manipulating Holst’s life, to pressure him into performing the operation. By then Steinmetz has become able to create a temporary human being, and in the hope that he can perhaps make his own creation perform the operation, he manifests a doppelganger of Dr. Holst. This double proceeds to take over Dr. Holst’s life, creating chaos for him professionally and personally. And then Dr. Holst starts fighting back. The ending has the dual virtue of being both unexpected and satisfying.

一只小林地生物（迈克尔·B·乔丹 配音）和一只雄伟的鸟（朱诺·坦普尔 配音）——山谷里天生的死敌——突然互换身体，必须合作（同时穿着彼此的羽毛和毛皮）才能度过他们生命中最狂野的冒险。