Skip to the chase and have the Batman battle the Legion of Doom. He's saved Gotham twice, it's boring...save the world. It's the only way Spacey's Luthor will be seen again, and who doesn't want that? Ron Perlman as Gorilla Grodd! Ben Kingsley as Brainiac! Hugo Weaving as Riddler!
He can recruit The Outsiders. Don Cheadle as Black Lightning. What more could anyone ask for?