BATMAN SUPERMAN WORLDS FINEST #56

Superman has sworn to protect life in every form; Ra's al Ghul is determined to wipe out ninety percent of Earth's population. When those two absolutes collide, the Man of Steel's fury threatens to carry him past the one line he has vowed never to cross.

Batman and Robin must find a way to stop an enraged Superman from taking that vengeance on their enemy — and shattering the code that defines him — before it is too late.