The most unexpected team-ups are afoot! Gotham's finest thief, Catwoman, finds herself embroiled in the endless battle for dominance between Sylvester and Tweety, and comes to the aid of her fellow cat. So naturally, Tweety calls on Black Canary to even the odds! Harley discovers a mysterious crate washed up on Coney Island's shore, curiously opens it and releases the big hairy beast that is Gossamer... who then proceeds to help her fight a giant robot. Daffy Duck makes a visit to Gotham to see the ACME headquarters, but discovers the building abandoned and overtaken by the clown prince of crime. Daffy is then offered a place by the Joker's side as his right-hand duck. Porky Pig takes an entry level job at LexCorp, only to find himself hauled to Washington, DC when a political scandal puts Lex Luthor in the sights of Congress. Worlds collide, courtesy of some of comics' greatest talents, among them Gail Simone, Jimmy Palmiotti, Amanda Conner, Shea Fontana, Mark Russell, Scott Lobdell and more! Collects Catwoman/Sylvester and Tweety Special #1, Harley Quinn/Gossamer Special #1, The Joker/Daffy Duck Special #1, and Lex Luthor/Porky Pig Special #1.