Superman: Reign of Doomsday #1

Having combined with the Phantom Zone creature, Luthor has achieved enormous power, and draws Superman to him to break him, but can't. The creature reasserts itself, causing Luthor to grant absolute happiness to all, but he gives that up by continuing to try to destroy Superman. Meantime Doomsday has kidnapped several heroes. Superman joins them, but together they find that Doomsday himself is held captive and they've been fighting three Doomsday clones, each with different powers.