Fan Casting Batman & The Flash: Crisis on Earth-89 (2023)

The Flash runs back in time using the Speed Force to save his mother, but after being punched by an unknown force he ends up in Earth-89 where he meets a slightly younger version of himself, Cyborg, Supergirl, and Michael Keaton's Batman. They are warned of the end of the world as Wonder Woman and Aquaman are at war, and Brainiac unleashes Doomsday. To help stop this war, they must find the missing Kryptonian, Superman, to save the world.