Bruce Wayne takes Mordecai and Rigby to Arkham City for an conference but they wined up in Arkham City as they become Bat Bird and Bat Raccoon as they team up with Batman to stop The Joker and Hugo Strange!

After Rigby has a cool dream, the gang becomes superheros. A short while later, they get to work with the Dark Knight himself. But of all the nights to begin their partnership with Batman, it had to be the night of Joker's takeover...How well will they react in the madhouse when it is under the rule of the maddest man alive?