In Undead Nightmare, a non-canonical, zombie apocalypse-themed alternate reality, John finds that the world is plagued by a virus that brings the dead back to life with a taste for flesh. After tying up the infected Jack and Abigail, John seeks to discover the source of the plague. He rides to Mexico, where he learns from a nun that Reyes might be responsible. John kills the zombified Reyes and finds a girl, who reveals that Reyes had desecrated several catacombs beneath the government building, and had stolen an ancient Aztec mask, unbalancing order and unleashing the undead. John and the girl head down to the tombs and return the mask. John returns home to find that his family has been cured. Months later, after his death, John rises from his grave, as the mask has been stolen again, causing the dead to rise; however, as John had been buried with holy water, he is a revenant who still retains his soul and his capabilities to use weapons.