*The Joker returns to Gotham City! The Joker is through working with the Legion of Doom, and he wants to get back to his roots: giving Batman absolute hell! The Clown Prince of Crime comes back with a bang-and he's not about to take prisoners! As if that weren't enough, Lex Luthor delivers the cure for Mr. Freeze's beloved wife, Nora, freeing her from cryo-stasis at last! But something else is very, very wrong with Nora... *Source: dccomics.com