Fans are excited because season 4 of “‘Supergirl’ is going to introduce iconic Superman supervillain Lex Luthor. Reddit user BFH took the time to imagine what it would be like if Tom Welling from “Smallville” would like playing the role. writes, “Although the fan artist uses an old photo of Welling, it isn’t difficult to see the former Superman actor in that particular role, especially since a close friend and former co-star of his, Michael Rosenbaum, could give him some pointers.