The Joker has been mysteriously released from Arkham Asylum, and he's none to happy about what's happened to his Gotham City rackets while he's been "away." What follows is a harrowing night of revenge, murder and manic crime as only The Joker can deliver it, as he brutally takes back his stolen assets from The Penguin, The Riddler, Two-Face, Killer Croc and others.