Up, Up, and Away

In Up, Up, and Away we find a depowered Superman having to deal with a disgraced Lex Luthor. In the DCEU, Lex Luthor cannot be more disgraced than he already is, while we do not know how death affects the Man of Steel.

Thus, the sequel could borrow all of these from the storyline, adding the final fight between a nearly fully powered Man of Steel and Lex Luthor in a battle suit. And this isn’t all. The Man of Steel sequel can also introduce the new Fortress of Solitude.

As we know, Lex Luthor learned from the downed Kryptonian scout ship. And so it isn’t too hard to assume that he has found some pieces of technology (Sunstone crystals) that can be used in order to build his iconic home in the Arctic.