Vigilante heroes are an extreme response to crime; Gotham City, one of the most crime-ridden cities in comic books, gave rise to one of the most extreme, and efficient, vigilantes there is: Batman. One storyline, Batman: The Black Mirror, ended with a horrifying hint at the future of Gotham, with the blame for the city’s troubles falling directly on one surprising member of the Caped Crusader’s rogues’ gallery.