Vampires appear throughout Stephen King's fictional multiverse. They appear in the novels 'Salem's Lot, Wolves of the Calla, Song of Susannah, and The Dark Tower; the short stories "One for the Road", "The Night Flier", "Popsy", and "The Little Sisters of Eluria"; and are mentioned in a number of other stories. Marvel Comics' The Dark Tower: End-World Almanac includes a detailed entry on their categorization.