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Warner Bros. is moving aggressively ahead with the big screen adaptation of DC Comics' Justice League of America, with George Miller (Happy Feet) on board to direct, reports Variety.

The project, which is in the initial phases of casting, is a pre-strike priority for the studio, which needs a superhero tentpole in 2009.

Still, making all the pieces fit has been complicated by overlapping superhero projects in the pipeline, since "Justice League" features a pantheon of superheroes, including Superman and Batman.

Batman and Superman are active properties for the studio, though the next installment in the Superman franchise has taken a backseat to "Justice League" in part because Warners is so keen on the "Justice League" script by Kieran and Michele Mulroney.

"Justice League" will likely feature the characters of Superman, Batman, Wonder Woman, the Flash and Aquaman.

The project is so complicated -- and casting dependent -- that even those deeply involved in the project are holding their breath until production begins.

"They're working very hard to get it to happen," said one party close to the project. "But there are so many characters it's complicated."

Jessica Biel is in talks to play Wonder Woman in Warner Bros.' all-star superhero film Justice League of America, reports Variety.

The potential deal marks the first piece of casting to emerge from the DC Comics-based ensemble project, which is expected to feature Superman, Batman, the Flash and Aquaman in addition to Wonder Woman.

George Miller (Happy Feet) will direct the big screen adaptation. Kieran and Michele Mulroney wrote the script.

Biel is filming the indie drama Powder Blue, which wraps in October, opposite Forest Whitaker. She will then segue to A Woman of No Importance, based on the play by Oscar Wilde. That leaves room on the actress' schedule for "Justice League," which Warner is fast-tracking as a project before any potential strikes. However, the film's likelihood hinges on the studio's ability to assemble a cast of superheroes in a small window of time.

The trade says the studio declined comment, saying that it prefers to announce an entire cast rather than piecemeal deals.