Here's an idea I thought of.
A big fight. A jailbreak from a big prison called Arkham City. Amogn the escapees are Joker, harley Quinn, Penguin, Deadshot, Captain Boomerang, King Shark, Killer Frost, Riddler, Two-Face, Scarface, Scarecrow, Black Mask, Grodd, Bane, Killer Croc, Killer Moth, Ra's Al Ghul, Vandal Savage, Klarion, Ubu, Firefly, Deathstroke, Black Manta, Zebra-Man, Cat-Man, and Soloman Grundy.
The ones standing to fight are the Justie-Leagu, the Teen Titans, Solovar, Anthro the Cave-Man, Cat-Woman, Lois Lane, Commisioner Gordon, and a few police.
Which side would win?