Superman - Action Comics: The Oz Effect

Since the dawn of the Rebirth era, Mr. Oz has been plotting against DCs heroes. But when Mr. Oz at last steps from the shadows, his true identity rocks the Man of Steel to his core. And if Superman refuses to join Mr. Ozs cause, maybe Superboy will! The stakes are raised when the Last Son of Krypton is forced to choose between his son and his adopted home planet. Collects ACTION COMICS #985-992.