After Maximilian Zeus is apparently freed from his cell at Arkham Asylum by a spirit named Grace, he attempts to kill Dr. Noah Green. Batman intervenes, but he begins to research the doctor's past. The spirit spooks the bats in Batman's cave and then takes control of the Batmobile and drives Batman to the site of an old campground before revealing itself to him. Batman discovers the decayed remains of a missing child who had been killed by the doctor. Back at the asylum the spirit frees the inmates and uses the Joker to torture and kill the doctor.