Following the news of Lex Luthor making his debut in CW's Supergirl season 4, fans have already expressed interest in who they want to be cast as the classic Superman villain: they're clamoring for Smallville alumni Michael Rosenbaum to reprise the role he played for seven seasons on Smallville.
Rosenbaum himself made a humorous response to one of these suggestions without actually revealing if he'd be interested in returning to the role.