Commish Gordon is talking with Bale Batman and Heath Joker when suddenly out of nowhere Clooney Batman and Jack Joker appear.. Gordon does not know what to think so he tells them to sort everything out and he leaves... this takes place all throughout Gotham City..

scenario # 1... Bale/Heath v. Clooney/Jack

scenario # 2... all out melee which means all four fighting against each other