A devious new doctor at Arkham Asylum is conducting unconventional experiments into the human psyche, and he kicks off a chain reaction of disaster when he experiments on Arkham's newest patient, The Maxx! The city of Gotham is starting to merge with The Maxx's psychedelic mental landscape, known as the Outback, blurring the line between real and unreal. It's up to Batman to save not just Gotham, but all of reality, and he and The Maxx are going to have to travel through some of the darkest places imaginable--the twisted minds of Batman's greatest enemies!