After the conclusion of the New Krypton event, Luthor became the lead character in Action Comics until issue No. 900. Written by Paul Cornell, the first storyline "The Black Ring" explores Luthor's new desire to locate the energy of the Black Lantern Corps. Aiding him in this quest is a robot duplicate of Lois Lane. To distract Superman and his closest allies from interrupting him, Luthor releases several Doomsday duplicates.