Justice League: Worlds Collide

Justice League: Worlds Collide was a planned DC Comics film when the first season of Justice League: Unlimited aired. It was supposed to take place between Justice League and Justice League: Unlimited.

Plot
The Justice League go against the Crime Syndicate, which consists of evil versions of themselves on an alternate Earth.

Why It Was Cancelled

 * 1) Most of the cancellation reasons are unknown other than the DCAU production team wanted to call other actors and actresses.

Results

 * The project was permanently cancelled.
 * Bruce Timm and his fellow DCAU production team upload the film's script as a pdf or adapting it as a comic book, bur they abandoned that idea.
 * Justice League: Crisis on Two Earths was produced in 2010.
 * Elements from the film were used in Justice League: Crisis on Two Earths.