Today we present the brand new Official Trailer from the shocking new experience for Red Dead Redemption – Undead Nightmare.

Follow John Marston in this nightmarish adventure as he tries to find a cure for “a virulent plague turning people into flesh-eating crazies” (as Seth Briars so eloquently puts it in today’s new trailer). Featuring a full new single player story with all new gameplay and multiplayer modes – along with new weapons, zombie animals , mythical creatures and even a brand new secret location – the Undead Nightmare Pack will be available very soon for download via Playstation Network ($15.95) and Xbox Live (800 Microsoft Points).