Fan Casting Arkham Asylum in Batman: The Court of Owls

At Arkham Asylum, Gotham's most criminally insane people reside there. In a cell, The Joker puts his ear to the wall and is talking to someone. On the other side of the wall, Harley Quinn is also talking to the Joker. They are talking about their plan to break out of Arkham with the "others". Harley asks, "What others?". Joker simply says, "Just some friends of mine who share the same goal...Kill the Bat." They both start laughing as we cut to black.