VIDEO : 'Supergirl' Getting New Iconic Villain

National City is about to get a new villain. "Supergirl" is bringing in classic DC baddie Lex Luthor for Season 4. "We've talked about having Lex on the show since its inception and we're excited to have him finally arrive. While Lex will not appear in the upcoming three-show crossover ? "Elseworlds" ? his nemesis and Kara Zor-El's brother will. Tyler Hoechlin is currently filming alongside the "Supergirl," "Arrow" and "Flash" cast members, having returned to the role of Clark Kent/Superman.