What if Bruce Wayne is actually in Arkham the whole time and Batman is just a delusion he has. All of his ‘villains’ are the orderlies and doctors who work there.

“Poison Ivy” is the nurse who sedates him when he gets out of control

“Two-Face” is an abusive orderly who acts nice when the doctors are around and then beats up the patients when their backs are turned

“Riddler” is a therapist who asks him questions that he has a hard time answering

“Mad Hatter” is a hypnotherapist who Bruce is convinced is trying to brainwash him

and of course his arch-nemesis..

“Dr. Joe Car” and his assistant “Dr. Harleen Quinzel” see Bruce as their top patient, both desperately trying to bring the man back to sanity, and Batman will fight with all he has to protect gotham from “Joker” and “Harley Quinn”