Michael Keaton, who gifted us with cinema's most bug-eyed insane Bruce Wayne in Tim Burton's Batman and Batman Returns, will reprise the role of the Dark Knight for The Flash movie starring Ezra Miller. According to The Wrap, Keaton's return will be part of The Flash's attempt to introduce the audience to the concept of a DC Comics multiverse. The film, according to the report, "sees Ezra Miller’s Barry Allen travel back in time to prevent the death of his mother. The result? Allen inadvertently creates another universe protected by Michael Keaton’s Batman, …