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Seemingly overnight, a zombie plague ravages the once bountiful frontier, decimating the landscape and reawakening the dead. In towns, settlements, and outposts throughout the world, the uninfected citizens are left to fight for survival against waves of the undead. John Marston must ride out into the vast and terrifying world and survive long enough to find a cure.

With four unique zombie classes - each with their own characteristics, plus new infected predatory animals roaming the countryside, and non-traditional weaponry like the Blunderbuss - which can be loaded with looted remains of fallen zombies, the Undead Nightmare Pack offers an entirely original gameplay experience for fans of Red Dead Redemption.

The all new single-player narrative features new challenges, quests, and ambient events, including Missing Persons, where the player must find a missing survivor lost amongst the throngs of undead. This new release also brings new content to Multiplayer, with Undead Overrun, a brand new multiplayer survival mode where waves of infected enemies attack and players must work together to stay alive against increasingly difficult odds.