Superman: The Last Days of Lex Luthor #1

Lex Luthor reveals to Superman that he is dying and asks Superman for help, knowing that Superman's moral code won't allow him to turn his back on Luthor and that Superman will do everything in his power to save the life of his greatest enemy. Clark reflects on growing up with Luthor in Smallville. Superman brings Luthor to Kandor seeking a cure for Luthor's condition.