Undead Nightmare

The  Pack is the latest DLC for Red Dead Redemption. The Pack features an entirely new single-player campaign that follows John Marston as he tries to find a cure for the highly infectious Undead plague that has spread across the frontier. The prices are $15.95 AUS dollars, $9.99 US dollars, £7.99, €9.99 or 800 Microsoft Points. It was released on October 26, 2010.

To start Undead Nightmare you choose single player in the main menu, and the options Undead Nightmare and Red Dead Redemption appear.

Synopsis
Seemingly overnight, an Undead 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.

Along the way through frontier towns, deserts, prairies, and mountain passes, Marston will help survivors, cleanse towns and put an end to the undead hordes.