Thread:Ripto22475/@comment-29867471-20160905153338/@comment-29867471-20161005193427

Hey Ripto, there's a TMNT and Batman crossover. In this comic book series, the Shredder and his clan are transported to another universe and come across Gotham City. He unleashes the Arkham villains from Arkham Asylum. He actually mutates some of the villains there, too. At first, I thought Harley Quinn wasn't there, but it turns out she's there.

Arkham villains:
 * Joker - mutant cobra
 * Harleen Quinzel/Harley Quinn - mutant hyena
 * Victor Fries/Mr. Freeze - mutant polar bear
 * Pamela Isley/Poison Ivy - mutant praying mantis
 * Bane - mutant elephant
 * Oswald Cobblepot/Penguin - mutant rockhopper penguin
 * Harvey Dent/Two-Face - mutant baboon
 * Jervis Tetch/Mad Hatter - mutant rabbit
 * Arnold Wesker/Ventriloquist - mutant blue-and-yellow macaw
 * Jonathan Crane/Scarecrow - mutant crow
 * Edward Nygma/Riddler - mutant raccoon

Basil Karlo/Clayface, Waylon Jones/Killer Croc, Scarface, and Ra's al Ghul were there, too. However, Clayface was only seen in the cover, including Jack Ryder/Creeper, who is insane, but not a villain. Killer Croc didn't got mutated since he already looks like one (he was born with it). Scarface obviously didn't mutated since he's a puppet.

For the heroes other than the Turtles and their allies, there's also Bruce Wayne/Batman (which is obvious that he's in there), Damian Wayne, Alfred Pennyworth, Lucius Fox, and Commissioner James Gordon. There's also Grifter/Cole Cash at one point.