A variation of the “Zombie Apocalypse” genre can be seen in Firefly and Serenity (moreso in Serenity), although the Reavers don’t really quite fit the zombie mold.
Spoilers for Serenity, for those few unwashed who haven’t seen it yet:
[Spoiler]The Reavers are a large population of humans from the planet Miranda, a modern, relatively new colony world near the edge of known space which was secretly subjected to a large-scale government test of a substance known as Paxilon Hydrochlorate, intended to remove aggressive tendencies from the population, making them easier to deal with (and making conflicts like the rather bloody and involved Unification War a thing of the past).
The Alliance scientists find that the results are rather horrific. 99.9% of the population has their aggressive tendencies eliminated, along with, quite literally, their will to live. Everyone just sits or lays down where they are, and calmly stops eating, drinking, and eventually breathing. The rest of the population, around 30,000 colonists, became hyper-aggressive, killing anyone who hadn’t already died, and eventually turning to cannibalism and self-mutilation. In later years, the Reavers become the Boogieman for those who live out on the Rim, occassionally attacking ships and small colonies, raping, killing, and eating most (if you’re very very lucky, in that order) and converting the few that remain via torture.[/spoiler]
Oh, and I kinda want to see “I Am Legend”, I’ve seen Will Smith do serious, and he can pull it off (he just usually doesn’t try). I can’t see HOW they’d give it a happy ending, at best, it might have an ambiguous “The Hero, or what passes for one in this film, has escaped with the girl to live another day” ending without any kind of resolution for him.