Brainiac
Batman v Superman: Dawn of Justice dropped quite a few hints concerning Brainiac. But even without them, the supervillain should appear in the DCEU in the Man of Steel sequel – especially since the Man of Steel is known to be dead.
Just like Darkseid and Zod before him, Brainiac has noticed that Earth possesses Kryptonian technology. And he is also on his way. Just like the new 52 version, he preserves worlds from a greater threat, in this case Darkseid. And he arrives on Earth and, with Superman being dead, he miniaturizes Metropolis.
Superman, weakened, awakens and somehow manages to defeat the villain. Maybe he even received help from Metallo, like in the new 52. He returns Metropolis to Earth and also frees the people of Kandor. This is the perfect way for Henry Cavill’s Man of Steel to make a brief exit from the DCEU.
Man of Steel 2 should end with Superman taking the bottled city of Kandor to another planet, with a Red Sun, where the Kryptonian civilization could be rebuilt.
