Red Dead Redemption: Undead Nightmare is an open world, western action-adventure video game developed by Rockstar San Diego and published by Rockstar Games. It was released for the PlayStation 3 and Xbox 360 consoles on October 26, 2010, as a downloadable expansion pack to Red Dead Redemption. The game follows John Marston as he searches for a cure for an infectious zombie plague that has swept across the American Old West.