Adds a zombie horror-themed single-player campaign, two multiplayer modes, and spooky cosmetic additions to the environments and characters of the open world Western action-adventure game. The alternate timeline story follows the returning protagonist and former outlaw John Marston as he seeks to find the cause and cure for a zombie plague that has infected his wife and son. Marston liberates towns overrun by the undead and assists other non-playable characters with quests along the way.