Rockstar Games has today announced new details for the upcoming Undead Nightmare Pack for the critically acclaimed Red Dead Redemption. The Undead Nightmare Pack will be available October 26, 2010 for digital download from both Xbox LIVE online PSN.

“Undead Nightmare turns the world of Red Dead Redemption upside down,” said Sam Houser, founder of Rockstar Games. “The supernatural vibe and the return of some favorite characters create a whole new game inside an already incredible world.”

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.

Four zombie classes enter the fray, each possessing unique characteristics, attacks, and defenses. Mythical creatures roam the frontier, alongside zombie cougars, bears, wolves and many more. Taking down the undead requires non-traditional weaponry, including the new Blunderbuss, which can be loaded with looted remains of fallen zombies. The deadly Tomahawk and the Explosive Rifle make a triumphant comeback and will be available exclusively for those who downloaded the Legends and Killers Pack and the Liars and Cheats Pack.

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. New competitive multiplayer and multiplayer free roam content includes Undead Overrun, a brand new multiplayer survival mode where waves of infected attack and players must work together to stay alive against increasingly difficult odds.

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. Undead Nightmare will be available at retail stores everywhere for £24.99 and does not require a copy of Red Dead Redemption to play.

The Undead Nightmare Pack will be available from Xbox LIVE (800 Microsoft Points) and PlayStation Network (£7.99) and requires a copy of Red Dead Redemption to play.

Sounds like Rockstar are really pushing hard with this extra content, in a not-too-dissimilar way than they did with the additional packs for GTAIV, only time will tell if the extra content up for grabs here is as good a package as The Ballad of Gay Tony and The Lost and the Damned though.

In the meantime check out this latest trailer of a really Wild West:

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