For her entire career as a criminal, Harley Quinn lived in the shadow of her beloved Joker. But when one joke went too far and drove Superman to kill, Harley found herself on her own for the first time...and teamed up with the very heroes she used to fight! With Superman now a brutal despot, Batman must lead a team of heroes and villains to form the resistance to the Man of Steel...and Harley is on the frontlines, whether Batman wants her there or not! For the first time in her life, Harley has her own identity, her own gang and a new sense of purpose. But will Harley throw it all away when her beloved Mr. J seemingly returns from the dead? Or will she take her place as a true hero in this strange new world?