The concept of the Multiverse, an interconnected web of different realities where all possibilities are realized across countless timelines, is having a big pop culture moment - and not just in superhero media, where it's become the current focus of numerous stories.
That includes The Flash, the new DC film in which Barry Allen teams up with a version of himself from another world in a story that crosses the DC Multiverse and brings in alt-versions of heroes including Batman and Supergirl.
