Justice League: Crisis on Two Earths is an original direct-to-video animated superhero film released on February 23, 2010. It is based on the abandoned direct-to-video feature Justice League: Worlds Collide, which was intended as a bridge between the then-concluding Justice League animated television series and its then forthcoming sequel series Justice League Unlimited. Crisis on Two Earths was reworked from the Worlds Collide script to remove references to the TV series' continuity. The film is directed by Lauren Montgomery & Sam Liu and written by Dwayne McDuffie.
The premise of Crisis on Two Earths is borrowed from the 1964 Gardner Fox-scripted Justice League of America #29–30 entitled "Crisis on Earth-Three!" and the 2000 Grant Morrison JLA: Earth 2 graphic novel, with a heroic Lex Luthor from an alternate universe coming to the Justice League's universe for help against the Crime Syndicate. The film is the seventh of the DC Universe Animated Original Movies released by Warner Premiere and Warner Bros. Animation. The two-disc special edition also includes an animated short featuring the Spectre.
On August 11, 2015, Warner Home Video re-released the film in a combo pack which includes a DVD and Blu-Ray copy, a digital copy, and the graphic novel on which it was based.