With Batman gone, the villains have descended on Gotham! A who's who of Bat-villains star in this one-shot including Catwoman, the Riddler, Harley Quinn, Two-Face, Poison Ivy, The Penguin and Ra's Al Ghul. What kind of havoc will these villains wreak on a city that's already on the verge of implosion? Who will oppose them? And could they all work together to take down Gotham City - or will they just destroy each other? Find out when THE UNDERGROUND rises!