Fan Casting ''The Darkest Knight of them All'' in Justice League: The Return of Brainiac

At the end of the film, after Brainiac is defeated by the Justice League, Doctor Fate opens up in a portal and banishes him to the Phantom Zone, while General Zod's Kryptonian forces retreat, and the Cyborg Superman chooses to commit suicide by flying into the sun. However, at the moment of being banished to the Phantom Zone, Brainiac screams in fear, and because he is to scream in the Phantom Zone for as long as he is there, plus the fact that they are extremely loud, they are heard from all across the multiverse. One person in particular hears the screams of Brainiac, the same man who witnessed the failures of the Anti-Monitor's plans to destroy the multiverse...