Arkham Asylum is a limited event. It is exclusive to DC Villains.
The patients in the Arkham Asylum have gained powers from The Big Bang and are going wild try to escape. Luckily, the news isn't big so the heroes do not know about it. Joker wants those patients in Arkham Asylum as a future army.
Suit up and head into Arkham Asylum, then put those patients in check!
- Alligence with Joker