Tales of the living dead abound in cultures across the world. The Norse draugar are the bodies of slain Vikings, said to inhabit their graves and jealously guard the treasures buried with their former selves. In Chinese folklore, jiang shi are reanimated corpses that hop around with their arms outstretched, sucking the life-force qi out of the living. And according to Medieval British accounts, deceased ne’er-do-wells may return as revenants – risen bodies bloated with blood – to terrorize their families and neighbors.