Mass escape at Arkham Asylum! Batman assembles the heroes he can at the Batcave before taking to the streets. A deafening explosion, and the Joker leads a pack of lunatics in through a side tunnel just as Deathstroke enters with a retinue of assassins paid to eliminate both the escapees and the crimefighters. Who could have engineered such a test for the Batman? Three teams of five will contend for Gotham! (We will try to keep groups together.)