Good news “Smallville” fans! Michael Rosenbaum will be back as Lex Luthor in the two-hour season finale of “Smallville” on May 13. Rosenbaum and the producers have agreed for Rosenbaum to reprise his role as Superman’s arch enemy, and both parties are very happy and excited about it. This is also the best news we heard, especially now that Clark is transitioning to Superman and the 10th season will be the last for the series. We have been waiting, actually, for news about Rosenbaum and we’re glad he’s coming back. He’s one of the best Lex Luthor in the Superman franchise and we’re very excited to know what he’ll do on the finale.