10 Crazy Stories Warner Bros Needs To Tell In The DC Movie Multiverse
9. Flash Of Two Worlds
The Flash movie is going to follow Barry Allen as he travels back in time to save his mother's life, inadvertently creating a new timeline in the process (a Flashpoint adaptation, basically). There are plenty of places the Fastest Man Alive can go from there, and "Flash of Two Worlds" would be a great jumping off point for a wacky DC Extended Universe adventure.
In the pages of The Flash #123, Barry Allen finds himself on Earth-2 after inadvertently vibrating his molecules too hard. On a new Earth, he comes face to face with his Silver Age counterpart, Jay Garrick.
Defining those Silver Age stories as having happened on an alternate Earth, this led to some huge stories and was, in itself, a lot of fun. Ezra Miller's Flash meeting Jay in a sequel would be a blast, and him spending time on a weird new planet with some big differences would make for a crazy movie.
This could open the door to a number of spinoffs down the line, and after visiting some familiar timelines (past film franchises, basically), the Flash should next spend some time on other Earths.