And there they were, in 2007. Marvel Studios was ramping up IRON MAN with plans to launch their own cinematic universe, and while THE DARK KNIGHT was halfway through filming, THE MAN OF STEEL, WONDER WOMAN and THE FLASH had stalled. WB decided to forego their caution and swing for the fences. The "Justice League Unlimited" cartoon was big. Kids loved it on TV. Why wouldn't they love it on the big screen?
JUSTICE LEAGUE: MORTAL was born. And as quickly as it came, it went. Originally, WB wanted it to be true spectacle, bringing together Brandon Routh and Christian Bale alongside Wonder Woman, Green Lantern, Flash, Aquaman and Martian Manhunter, who would then get their own spin-off franchises. Kieran & Michelle Mulroney was set to write a script adapting the "OMAC Project" storyline, with Maxwell Lord and Talia Al Ghul as villains.
In the cast, WB wanted Jessica Biel as Wonder Woman, Reynolds back as Green Lantern, Leonardo DiCaprio as Aquaman, Laurence Fishburne as Martian Manhunter, Scarlett Johansson as Talia and Mel Gibson as Lord, plus Kevin Spacey back as Lex Luthor.
The main obstacle? Christopher Nolan. He had a very specific vision for his Batman, and other superheroes were a big no-no for him. He objected vehemently to Bale getting mixed in, and as a result, WB compromised.
Nolan's movies would run their course, and they'd have another Batman in their potential cinematic universe. But first, they needed a director, and after brief negotiations with David Slade and Joe Carnahan (who also met with Marvel to helm THE AVENGERS), they found their man in George Miller.