Issue: #1
DC'S WORLD'S GREATEST DETECTIVE AND SERGIO BONELLI'S NIGHTMARE INVESTIGATOR UNITE!See how the fates of Batman and Dylan Dog intertwined in the past through their lethal nemeses: The Joker, the Clown Prince of Crime of Gotham City, and Professor Xabaras, a mad genius with a taste for bringing the dead back to life!Joker is in London to seal a hellish pact with Dylan Dog's nemesis, the Mephistopheli...
Creators: Gigi Cavenago, Giovanna Niro, Laura Ciondolini, Pat Brosseau, Roberto Recchioni, Werther Dell'Edera
Characters: Harley Quinn, Catwoman, Batman, Joker, John Constantine, Mr. Freeze, Riddler, Killer Croc, Scarecrow, James Gordon, Groucho, Inspector Bloch, Penguin, Two-Face, Alfred Pennyworth, Man-Bat, Etrigan, Clayface (Karlo), Dylan Dog, Epicurus