Zack Snyder's planned Justice League 3 would have adapted a major Jor-El prophecy from Richard Donner's Superman and applied it to Batman. After Justice League's massive 2017 rework, the 2021 release of Zack Snyder's Justice League brought Snyder's original vision for the film out for the world to see. It also saw Snyder's layout for Justice League 2 and Justice League 3 publicly released, and the latter reveals a most unexpected twist on Donner's 1978 Superman.
In Superman, with Krypton facing imminent destruction, as Jor-El (Marlon Brando) and Lara (Susannah York) prepare to send their infant son Kal-El to Earth, Jor-El foretells his son's future heroism. In Jor-El's words, "You will carry me inside you, all the days of your life. You will make my strength your own, see my life through your eyes as your life will be seen through mine. The son becomes the father, and the father, the son." These exact sentiments would be repurposed in Snyder's plans for the Justice League sequels, specifically in Justice League 3 with Batman's ultimate act of heroism.
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Justice League 3 would see the League marshaling the forces of humanity, Atlantis, and Themyscira against the conquest of Earth led by Darkseid (Ray Porter). In the final showdown, Batman (Ben Affleck) was to sacrifice himself, while Superman (Henry Cavill) and Lois Lane (Amy Adams) would name their son Bruce Kent in his honor. Twenty years later, Bruce Kent would become the new Batman, echoing Jor-El's words, "The son becomes the father, and the father, the son."
With Snyder intending his DCEU films to encompass a five-part story, Henry Cavill's Superman was the saga's foundation, but the roles of his
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