Direct-elimination alphabetical team battle. Winning team moves on to face next team.
Team B: Beta Ray Bill, Bizarro, Black Adam
Team C: Captain Atom, Captain Marvel, Cyborg Superman
All DC characters pre-52 versions. All characters standard versions, in character, but fighting to win. No amps, prep, special versions, special items, or any of that.
Random encounter, basic knowledge, no BFR, no PIS. Fight on Earth in the desert, start 50m apart. Win by KO, death, or permanent incapacitation.