Clark Luthor

Clark Luthor is the Earth-2 counterpart of Clark Kent, appearing as an antagonist in the tenth and final season of Smallville. Like his normal counterpart, he is played by Tom Welling.

History
In the Earth-2 universe, Kal-El came to Earth during the meteor shower that hit Smallville, Kansas in 1989. However, instead of being found and adopted by Jonathan and Martha Kent, he was found by Lionel Luthor, who adopted him, named him "Clark," and raised him as his own alongside his own biological children Lex and Tess.

Clark Luthor had a tense rivalry with his adoptive brother Lex and began an incestuous relationship with his adoptive sister Tess. He also worked as his adoptive father's enforcer, using the alias "Ultraman," and at some point became the CEO of LuthorCorp Media (the Earth-2 version of the Daily Planet).