Lex Luthor is coming to Supergirl

The Hollywood Reporter

The CW has begun a casting search for the iconic DC Comics villain. "We’ve talked about having Lex on the show since its inception and we’re excited to have him finally arrive," Supergirl's executive producers said in a statement. We can’t wait for him to shake things up in National City and watch him go toe to toe with not only Supergirl, but his sister Lena Luthor (Katie McGrath)."