Canon Superman beats down Superboy-Prime in a last slugfest without powers, saying that "It's not about where you're from. It's about what you do. It's about action."
The Joker gets his revenge for being left out of the Secret Society by giving Alexander Luthor two shotgun bullets to the head.
Lex Luthor: Oh, Alex. You made a lot of mistakes. You underestimated Superman. Superboy. Me. But the biggest one? You didnít let the Joker play.
Wonder Woman talking down Batman from shooting Alexander Luthor. It shows not only her character development, but Batman's, choosing to be the better person rather than give into Alex's claims about the universe. He also preserves his morals.