A post shared by Andy Muschietti (@andy_muschietti)Muschietti previously teased first looks at Michael Keaton and Ezra Miller’s costumes.“The Flash” will introduce general audiences to the idea of the multiverse: one of the of core concepts underpinning DC Comics. For the non-fanboy set, the multiverse refers to a shifting number of alternate universes that coexist within the larger reality depicted in DC comics.