See Marston take on the "Undead Nightmare" in this debut trailer for the upcoming Red Dead Redemption add-on pack.

http://www.youtube.com/watch?v=DSpaTPd3vRA&feature=player_embedded

Undead Nightmare will feature a new single-player adventure infested with — those things are everywhere! The add-on will include new gameplay mechanics, weapons, zombie animals, "mythical creatures" and a new secret location; in addition to new multiplayer elements, including eight zombie characters. The DLC pack is expected for release this fall on PSN and Xbox Live for $9.99/800 Microsoft Points.