In a recent interview, director George Miller talks about what happened with his defunct 2008 Justice League movie.
Miller's Justice League Mortal script is also online, and check out various art and images related to the movie below.
Justice League was the main one. That was, oh, seven years ago, I think. And there was a really great script. And Warners said, “Let's do it. Let's do a Justice League.” I really was attracted to it. But there was a writers strike looming. We had to cast it very quickly, which we did with Warner's casting people. And we cast it really quickly and we mounted it very quickly. And it depended on a start date and it depended on some basic rebate legislation that had just got through a new Australian government. But it was just too big a decision for them to make in the time. And that fell through and the whole film fell through. We almost got there. And it wasn't to be. But that happens a lot, where films line up and the stars look like they're aligning and they didn't.
The Justice League Mortal cast included:
Armie Hammer (Batman), DJ Cotrona (Superman), Megan Gale (Wonder Woman), Adam Brody (The Flash), Common (Green Lantern), Santiago Cabrera (Aquaman), Teresa Palmer (Talia Al Ghul), Zoe Kasan (Iris Allen), Hugh Keays-Byrne (Martian Manhunter) and Jay Baruchel (Maxwell Lord).
Megan Gale Wonder Woman concept:
Superman Vs. Wonder Woman storyboards: