Mine would be far different than most for a JL movie.
We begin a knee-deep in the middle of an all-out war with an alien race that is not from Apokolips (perhaps the Dominators or the one from Legion Lost original series). In the first five minutes, the League goes down. The first to get handed his butt is Superman, followed by Green Lantern Hal Jordon, but in the end, they all go down … HARD. Which leads to the guerrilla war that takes up the bulk of the movie, led by not the core seven but the extended JL (led by GL John Stewart, and consisting of Fire, Green Arrow, Metamorpho, Nightwing, and a core group of B-Listers). They search out other heroes now hiding away from the invaders and build up a group to rescue the core seven from the alien invaders. In Act III, the JLUnlimited frees the JLCore and together they kick some alien butt, teaching the Core JL that they’re not the end-all-be-all in superheroes and they decide to open up League membership to the other deserving heroes.
For the full article: http://atomicanxiety.wordpress.com/2013/02/12/pitching-the-justice-league-movie/