Rockstar Games has announced new details for the upcoming Undead Nightmare Pack for the open world western, Red Dead Redemption, that will be available October 26th, 2010 on Xbox LIVE and the PlayStation Network.

Undead Nightmare introduces hours of a new single-player storyline and brand new multiplayer content. 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.

Also coming soon, Undead Nightmare, a single, stand-alone disc that bundles together for the first time ever, the Undead Nightmare Pack, the Outlaws to the End Co-Op Mission Pack, the Legends and Killers Pack, the Liars and Cheats Pack and all the Multiplayer Free Roam modes released to date in stores for $29.99 and does not require a copy of Red Dead Redemption to play.