Red Dead Redemption: Undead Nightmare is a single-player expansion for the PlayStation 3 game Red Dead Redemption. In this narrative-driven add-on, protagonist John Marston navigates a surreal landscape overrun by a zombie apocalypse while seeking a cure for a deadly plague infecting the Old West, blending elements of horror and action in an open-world setting.
Red Dead Redemption: Undead Nightmare, later released as a standalone game, adds a new single-player experience in which Marston searches for a cure for an infectious zombie plague that has swept across the Old West.