Rockstar Games has released the Red Dead Redemption, Undead Nightmare pack today for Xbox LIVE and the Playstation Network. The pack can be downloaded for only $9.99 for those player who already have the Red Dead Redemption game.

For those video game players who do not already have Red Dead Redemption, the release date for the standalone disc-based collection will be November 23.

The Undead Nightmare pack includes a new single-player campaign which will follow John Marston as he looks for a cure to the zombie plague.

Once you have downloaded the pack, you should be able to play it, by choosing “single player” from the main menu, and then choosing “Undead Nightmare”.

There will be new single player missions, as well as 8 new multiplayer characters, and new game play mechanics. You can also expect to see new weapons & outfits, new modes for multiplayer gaming, and much more.