Had a newly-discovered Justice League script from 2011 been used by Warner Bros., audiences would have seen a movie with Darkseid as the main villain, opposed by a lot of familiar DC Comics superheroes.
According to The Wrap, the draft was written by Will Beall, the scribe on James Wan's upcoming Aquaman movie, and dealt with a full-blown invasion of Earth by Apokolips . Developed before the DC Extended Universe was put in place, Beall's story revolved around Desaad mentally enslaving Superman, who then conquered Earth in Darkseid's name.
The story also spanned the galaxy, with John Stewart and Hawkman investigating the threats of Apokolips, which resulted in the elimination of the Corps on Oa, driving Stewart to unite with the League. Apart from these cosmic adventures, the script also tied in is the concept of time travel, with Superman journeying to the future to meet a resistance boasting older versions of Batman, Wonder Woman, their son Clark and, surprisingly, Lex Luthor.
The script also included several elements that made it to the DCEU, including an armored-up Batman fighting the Man of Steel, Barry Allen traveling to the past to warn of the impending doom, and the Amazons joining the battle against Darkseid's armies. A different incarnation of the Suicide Squad was planned, featuring Deathstroke and Huntress fighting back against the invading aliens, painting an even larger scope than director Zack Snyder's film.
Now in theaters, Justice League stars Ben Affleck as Batman, Henry Cavill as Superman, Amy Adams as Lois Lane, Gal Gadot as Wonder Woman, Jason Momoa as Aquaman, Ezra Miller as The Flash, Raymond Fisher as Cyborg, Willem Dafoe as Vulko, Jeremy Irons as Alfred Pennyworth, Diane Lane as Martha Kent, Connie Nielsen as Queen Hippolyta, Amber Heard as Mera and J.K. Simmons as Commissioner Gordon.