http://www.newsweek.com/multiverse-theory-explained-spider-man-no-way-home-marvel-brian-greene-alan-guth-fred-adams-1652915

Comic book fans and moviegoers alike are eagerly awaiting the release of the next installment of the Spider-Man movie franchise, No Way Home, in December. Trailers for the film feature Tom Holland's Peter Parker and Dr. Strange, played by Benedict Cumberbatch, facing off against familiar villains from alternate Universes like Alfred Molina's Doctor Octopus.

Speculation is rife that even an alternate Spider-Man or two may even pop up from their respective Universes to lend the Marvel Cinematic Universe's version of the character a hand in defeating the multiversal bad guys.