Lex Luthor of DC's Superman fame takes on Black Bolt of Marvel Comics' Inhumans characters.
Lex Luthor is post-crisis, pre-New 52 version. He has 3 months prep and also possesses prior research on Black Bolt and the Inhumans. He has access to every resource on Lexcorp during the 3 months of prep.
In-character for Lex Luthor, blood-lusted for Black Bolt, with battlefield taking place across the entire planet Earth. No BFR. Winner by opponent's death or opponent's knock-out and subsequent capture.