Lex Luthor is a billionaire industrialist, inventor and scientist, as well as one of the most intelligent people in the world and the best friend-turned-archenemy of Superman. He was briefly seen in the Teen Titans Go! To the Movies.
He is bald and wears a L-Corp suit.
While the Teen Titans explain that every arch-nemesis is around the world, Cyborg mentions Lex Luthor as Superman's arch-nemesis with a backdrop of him in it. Later on, after the Titans changed the all of the heroes' pasts, Lex Luthor was in the villain rampage by shaving people's heads like his own head.