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Australian director Ryan Unicomb has announced that "Miller's Justice League Mortal" is underway. It is a documentary aiming to tell the story behind George Miller's "Justice League: Mortal" which was canceled in 2008.

Back in 2007, Warner Bros. hired Miller to direct a "Justice League" film, which would exist alongside Christopher Nolan's Batman films at the time. Filming was scheduled to take place in Australia and a number of actors had signed up for the project. The film would have starred Armie Hammer as Batman, D.J. Cotrona as Superman, Megan Gale as Wonder Woman, Adam Brody as The Flash, Common as Green Lantern, Santiago Cabrera as Aquaman, and Hugh Keays-Byrne as Martian Manhunter.

Unfortunately, due to multiple problems, the film was canceled. Warner Bros. decided to focus on individual films like "Green Lantern" and "Man of Steel" and scuttled Miller's take on the "Justice League".

Now, Unicomb has teamed up with producers Aaron Cater and Steven Caldwell to develop a feature length documentary. "I have always been fascinated with project, which would be in the same vein as 2013's Jodorowsky's 'Dune' and this year's 'The Death of Superman Lives: What Happened?', about a Superman movie that Tim Burton was to direct in the 1990s," he explained.

The producers also eyed writer/author Maria Lewis to help develop the documentary. The plan is to interview some of the cast and crew who would have worked on the film. They also plan to show never-before-seen artwork and costumes, but the release date of the documentary has not been announced until now.