Originally this feature was supposed to be a tie in between the "Justice League" and "Justice League Unlimited" seasons called "When Worlds Collide". Some factors are obviously left in the script such as the acquisition of Wonder Womans Invisible Jet, and the development of the new Watchtower and it's teleporter, Also, the seventh member of the Crime Syndicates "heads" is Zauriel (an analogue for Hawkgirl who was the Leagues seventh member in the Justice League series). The script Dwayne Mcduffie wrote was mainly kept intact, but due to Warner Bros. animation studio becoming defunct, It was decide to be released as an original, individual feature
Superwoman: "I take it back. You are much crazier than I am."
Owlman: "Don't get in my way."
Superwoman: "On the contrary, <smooch>, I'm in."
Just like other DCUA Original Movies that came before this one, Justice League: Crisis on Two Earths has received very positive reaction.The World's Finest, one of the first sites to review the movie, said, "...the film ranks up there as one of Dwayne McDuffie's better works in the animated DC world and even though it’s reminiscent of stories we’ve seen in animation before, the brilliant work done by Moi, the directing by Sam Liu and Lauren Montgomery, and story make it more than worth watching again."