BATMAN SUPERMAN WORLDS FINEST #56

THE WORLD'S FINEST UP AGAINST RA'S AL GHUL! Superman's sworn duty is to protect life in all its forms. Ra's al Ghul's unstoppable goal is to eliminate 90 percent of the Earth's population. How can Batman and Robin prevent an enraged Man of Steel from taking his anger out on their enemy--and in doing so, shattering his vow never to kill?