As a child, Michael Walker wished every day could be Christmas. That is, until a tragic accident crushed his holiday spirit. Thirty years later, Michael still can't muster any joy for the holidays, despite encouragement from his playful wife and well-intentioned parents. But when his young son faces a tragedy, Michael needs to make amends with his past. A mysterious man named Nick gives Michael a gift and instills in him the courage to find the joy that he lost.

A parasitic alien soul is injected into the body of Melanie Stryder. Instead of carrying out her race's mission of taking over the Earth, "Wanda" (as she comes to be called) forms a bond with her host and sets out to aid other free humans.

二十多岁的Ben（杰森·雷特 Jason Ritter 饰）和Alan（杰克·桑德维格 Jake Sandvig 饰）成天吊儿郎当，似乎永远都长不大。二人靠着偷车和出租隔壁的房子混日子。不久不堪重负的单身妈妈Lynette（凯莉·普雷斯顿 Kelly Preston 饰）带着小儿子Kelsey（钱德勒·坎特布瑞 Chandler Canterbury 饰）搬了进来，成了他们的新房客。这对损友很快就发现Kelsey早熟得很，甚至渴望想参与他俩的偷窃勾当。但是Alan的姐姐Mel（丽贝卡·豪尔 Rebecca Hall 饰）怀疑Kelsey是个缺乏管教的“钥匙小孩”，决定不能坐视不管。但是她半路杀出却引发了一系列意想不到的风波......