All the pieces are starting to fit together as the Batman Who Laughs acquires another key element in his plan—one that is linked to the founding fathers of Gotham City and to a legacy started by the Wayne family and protected by none other than Oswald Cobblepot. While the Penguin goes head-to-head with the darkest version of his mortal enemy, Batman is forced to compromise his principles and purge the serum that protects his heart from the deadly Joker Toxin! It's a no-win situation as writer Scott Snyder and artist Jock return to the sociopath they created in "Black Mirror:" James Gordon Jr.