I described the movie to my mother as a crime drama with a psychic. I think they explained some of the canon mythology during the show, but not a lot of it.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited