The world as we know it has come to an end, and that's not much more of an inconvenience for Columbus (Jesse Eisenberg) than he was already used to. He's a Mountain Dew-chugging loser whose introverted ways have turned him into an ideal loner for the post-apocalyptic realm -- as paranoid, vigilante and neurotic as they come, beholden only to his own strict set of rules (cardio good, bathrooms bad, always shoot zombies twice, etc.).
And so, while he doesn't want to become attached to the scruffy likes of Tallahassee (Woody Harrelson), their chance meeting provides as good an excuse as any for Columbus to try and recover whatever's left of his family in... well, Columbus. Oh, the names? Again, no one wants to get too attached once the infection hits the fan. That's just how one tends to roll as a resident of Zombieland.