I haven't seen those Smallville episodes with Clark Luthor, but I'm fangirling that the logo on his shirt is the symbol used by Ultraman, a badguy Superman from an alternate Earth who is part of the Crime Syndicate (instead of the Justice League).
"It is a remarkable dichotomy. In many ways, Clark is the most human of us all. Then...he shoots fire from the skies, and it is difficult not to think of him as a god. And how fortunate we all are that it does not occur to him." -Batman (in Superman/Batman #3 by Jeph Loeb)
