The Multiverse is something that is beyond understanding, at least that’s what Doctor Strange says. The concept of the multiverse is that there are an infinite number of alternate realities where the differences can go from minor to the most extreme. Multiple franchises use this concept to explain alternate continuities and versions of characters. The most well known are the universes of Marvel and DC. Marvel is currently going full speed into the concept for their Marvel Cinematic Universe. With shows like the Loki series and WandaVision on Disney Plus and films like the recent Spider-Man: No Way Home and the upcoming Doctor Strange in the Multiverse of Madness using it as a major part of their stories we can only speculate what will come next.
WARNING: THE FOLLOWING TEXT MAY CONTAIN SPOILERS. CONTINUE AT YOUR OWN DISCRETION.
With the concept of visiting alternate realities the possibility of seeing characters that died in the main timeline but might have lived in another could return. Though Robert Downy Jr. would ask for a load of cash to return there is always the possibility of seeing an alternate Tony Stark. Perhaps even Aaron Taylor-Johnson’s version of Quicksilver could possibly make some sort of return.
With Spider-Man: No Way Home bringing in alternate realities of pre-MCU Marvel films maybe there might be a chance of seeing old actors reprising their roles. Chris Evans once joked about a movie or show where his Captain America would team up with his old version of The Human Torch in a buddy cop movie. Not to mention the likelihood that the Multiverse will be used to bring the X-Men/Mutants into the MCU like with Evan Peter’s Quicksilver in WandaVision. 
Who’s to say that we won’t see Nicholas Cage’s Ghost Rider, Eric Bana’s Hulk, David Hasselhoff’s Nick Fury or even Matt Salinger’s Captain America. If DC’s Arrowverse’s “Crisis on Infinite Earths” event was able to do that why not the MCU?
One more thing the Multiverse could achieve would be to either redo certain characters or storylines that were seen as underwhelming when compared to the comics, most notably certain botched villains and side characters who never achieved their full potential in the MCU.
What do you think Marvel will do with the Multiverse? Will they continue to utilize it going forward? Or is it just a thing they will use sparingly?
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