剧情简介
　　
2012年，人类被不知名病毒感染，纽约成为一座空城。Robert Neville（Will Smith 饰）是为军方服务的科学家，也是对病毒有免疫力的幸存者。白天，他带着狗Sam在街道上寻找食物，用广播寻找幸存者，在实验室里研究治愈病毒的方法；晚上，他只能躲在屋子里，因为那些感染病毒而没有死亡的人们，成为了“夜魔”只能夜晚出来活动，丧失理智，会攻击所有的人。
　　
某天，Sam也感染病毒死去，Robert Neville陷入了前所未有的孤独。当他准备和“夜魔”们同归于尽的时候，另外一个幸存者Anna(Alice Braga 饰)救了他。Anna相信山上的隔离区还有幸存者，但是固执的Robert Neville却坚持守在纽约。
　　
又一个晚上，“夜魔”攻击Robert Neville的住所，此时他的研究已经获得成功，但是只有坚持到天亮，人类才能得以延存。

对话文本:普特网友，文本只包括旁白影评部分，不包括电影原声。

I Am Legend is a new film directed by Francis Lawrence. It's based on a well-known beloved science fiction novel by Richard Matheson that's been made into movie several times before starring Vincent Price and also Charlton Heston.

This one stars Will Smith. He plays Robert Neville, an army officer doctor and medical researcher who also seems to be the last man left alive on the island of Manhattan after a virus has wiped everyone out and forced the evacuation of the city. He is not entirely alone. Neville has a faithful German shepherd named Sam and there're also a lot of mutant zombie types running around on the island. They can't come out in daylight because they'll disintegrate or shrivel or die or something. But when the sun goes down, they come out looking for prey and they are the usual scary movie zombies. They wanna eat everyone in sight and they move very fast.

The movie, however, is best when it moves slowly. The first hour of this is really terrific because of the way that Francis Lawrence and a team of CGI effects specialists has emptied out the city and presented us some very familiar landmarks and yet it all looks very real and very vivid and there's something haunting about this but also sort of attractive about it. And imagine what a playground it would be if you could go out, deer hunting, if you could drive as fast as you want, all without leaving Manhattan.

And Will Smith is the other great asset that this movie has. He is one of the few movie stars I can think of who could carry a movie pretty much all by himself without another human being to talk to or to riff off ireful to the serve as his foil or a straight man. It's perhaps inevitable that this movie, because it is a genre movie, it's a zombie movie, a science fiction horror movie, an action movie, does disappoint in the end. The last half hour or so it gets very conventional, very sentimental. I won't tell you what happens, but it suffices to say that it doesn't quite live up to either the hauntingness or the enchanted fantasy aspects of its premise. But it is still a pretty good time.