故事开始于1964年,阿维(李戴 饰)自幼便生活在原始雨林中,从来都没有接受过文明的洗礼,也不知道人类社会的存在和其中的规则。一天,阿维偶然邂逅了名为华特(约翰·库萨克 John Cusack 饰)的制图员,华特惊讶于自己的发现,决定将这个孩子带回文明社会。
刚开始,骤变的生活环境让阿维感到十分的不适,没有人愿意和他这样的野孩子做朋友,在学校里,他认识了拥有印第安血统的女孩艾伯丁(安娜·帕里约 Anne Parillaud 饰),后者成为了他第一个朋友。最终,阿维还是选择回到了故乡,成为了一名猎人,一晃眼多年过去,命运让他和艾伯丁重逢了。
Big Baby tells the story of Adam Lewis, a successful horror screenwriter struggling for inspiration for his latest script. After a graphic and realistic nightmare of a hulking man dressed in a baby mask and onesie who axe murders his girlfriend Kate in the middle of the night, Adam gets the inspiration he needs for his new screenplay. Excited about the direction his story is taking, he starts losing himself in his script. Things are better than ever for Adam and Kate until “Big Baby” starts appearing in real life and tormenting and killing victims fueled by his own revenge. Characters from Adam’s script begin to pay him visits pleading for their lives, and he quickly realizes he holds their fate in his hands. Power and fear completely consume Adam until his girlfriend Kate is terrified of the man she once loved.