Justice League: Crisis on Two Earths is a 2010 animated feature film based on DC Comics concepts of the same name.
Drawing significantly from Grant Morrison's JLA: Earth 2 graphic novel, this movie starts on an alternate Earth where the roles of heroes and villains have reversed. A heroic Lex Luthor steals the "Quantum Trigger" from the Crime Syndicate (a villainous analogue to the Justice League) and escapes to Earth One where he meets our Superman. After hearing his story, the Justice League goes to Earth 2 to battle the Crime Syndicate.
The film stars William Baldwin, Mark Harmon, Chris Noth, James Woods, Brian Bloom, Jonathan Adams, Josh Keaton, Vanessa Marshall and Bruce Davison. It was written by Dwayne McDuffie and directed by Sam Liu and Lauren Montgomery.