Fan CastingThe Flash

After discovering he can use his speed to time travel Barry Allen aka the Flash travels to the past to save his mom from a mysterious yellow figure which causes a paradox and universes start converging. Barry Allen eventually has to team up with Jay Garrick the Flash of Earth #3 to recreate the experiment that gave him his powers after the change in time caused Barry to lose his powers. Throughout the movie Barry and Jay try to stop the multiverse from collapsing while also fighting an evil version of Flash called Black Flash from Earth 2. Barry and Jay eventually get Barry's powers back and Barry tries to go back in time but is attacked by Black Flash who pushes Barry into another universe. The two fight throughout several universes and eventually land back on Earth 3 where Barry meets up with Jay who tells him Black Flash is an entity that comes out of its sleep when someone is crossing universes to kill them. He tells Barry they need to get him back to Earth 1. Barry gets ready as Black Flash comes after him and the two race all the way to the moment the yellow figure killed Nora Allen. Barry tackles his past self and allows the figure to kill his mom which resets everything.