While philosophers and scientists have debated the multiverse theory for centuries, the version of pop culture we know today dates back to DC Comics’ “All Star Comics #3” back in the year. 1940. Most fictional multiverses operate under the assumption that there are infinitely many versions of the same timeline, all existing simultaneously. This concept can be used to great comedic effect, as in the intergalactic cable TV episodes of “Rick and Morty” or the sausage finger universe of “Anywhere Anytime” , but it can also be a tool for storytellers to explore any possibility they can imagine.
It also helps to loosen up the rules a bit regarding consequences, because as long as the hero can keep jumping the universe, the story will continue. There’s something liberating about that escapism, which feels like a return to the plot-jumping laziness of 1990s shows like “Quantum Leap” and “Sliders,” where the serialization is just a later thought. Life is sequential enough; We are all stuck in linear time, and every moment depends on what happens before and after. Freedom from the wheel, even if it’s fictional, is a real pleasure.
https://www.slashfilm.com/983036/doctor-strange-the-flash-and-everything-why-now-is-the-moment-for-multiverse-films/ Why now is the time for multiverse movies