https://www.cbc.ca/news/entertainment/doctor-strange-horror-1.6445254
Doctor+Strange in the_Multiverse_of_Madness will rise to the top of the heap of these MCU movies.
https://www.digitalspy.com/movies/a39912011/doctor-strange-2-ending-explained/
The Multiverse isn't just an entertainment concept.
https://en.wikipedia.org/wiki/Features_of_the_Marvel_Cinematic_Universe#Multiverse
There is a Multiverse theory.
https://www.space.com/32728-parallel-universes.html
https://www.livescience.com/multiverse
https://www.space.com/31465-is-our-universe-just-one-of-many-in-a-multiverse.html
Some see it as just Sci-Fi entertainment. Yet, there could be several dimensional planes of cosmic reality.
https://blogs.scientificamerican.com/cross-check/multiverse-theories-are-bad-for-science
https://astronomy.com/news/2020/12/is-the-multiverse-theory-science-fiction-or-science-fact
https://daily.jstor.org/the-real-science-of-the-multiverse/
https://marvelcinematicuniverse.fandom.com/wiki/Multiverse
https://thedigitallabyrinth.blogspot.com/search?q=Doctor+Strange