Justice League Mortal

Justice League: Mortal is both an abandoned and cancelled 2009 superhero film, based on the DC Comics characters in the Justice League cartoon series. The film was going to be directed by George Miller with a script written by Kieran and Michele Mulroney.

Plot
The film itself would revolve around Batman, dissatisfied with metahumans in the world, creating an army of robots to replace the Justice League, only for it to backfire and result in a legion of evil AI robots bent on world domination.

Why It Was Cancelled
2. A Writer Strike Hit.
 * 1) The cancellation of the film was led by the success of The Dark Knight.

Results

 * A live-action Justice League film was released in November 2017.
 * An upcoming 2018 documentary on the film, directed by Ryan Unicomb and produced by Maria Lewis and Aaron Cater is scheduled for a release.