After years of seeing zombies in games and movies, you, or at least someone you know, would probably have some thoughts on what to do if the undead were to attack tomorrow. That wasn't the case 100 years ago, though, so when the dead start coming back to life in Red Dead Redemption's world, nobody has a clue what's going on or how to deal with it. Reprising the role of protagonist John Marston, you become embroiled in the battle against the undead when the brain munching hits a little too close to home. And as Undead Nightmare's story unfolds, it becomes clear that similar events are playing out across the entire map from the original game. This horror-themed and often humorous add-on isn't the tour de force that Red Dead Redemption was, but it's great fun and a welcome excuse to return to memorable locations like Blackwater, Armadillo, and Chuparosa.