10 Marvel Villains GUARANTEED To Join MCU
5. Mephisto
In the comic books, Mephisto is a demon, but for all intents and purposes, he's the Devil, and he's been a constant foil to the Sorcerer Supreme of Earth since the beginning, Thus far, Dr. Strange has tangled with Dormammu, but he hasn't fought Mephisto, and it's high time he did.
Doctor Strange in the Multiverse of Madness is not only a sequel for the Master of the Mystic Arts, but it's also the final film on the Phase Four schedule, so it stands to reason that the good Doctor will go up against someone formidable.
Thus far, the only villains yet to be disclosed by Marvel Studios have been Karl Mordo and Nightmare, but no mention of Mephisto has yet to be made. That's not surprising, given how tight-lipped Marvel and Disney have been about their projects, but there's a good chance Mephisto and/or his realm will appear.
Doctor Strange has gone up against the demon on a number of occasions, including the time he helped free the soul of Doctor Doom's mother, the Damnation storyline, which followed Strange's restoration of the population of Las Vegas from "Secret Empire," and many more instances have seen the two go up against one another suggesting it's only a matter of time for the MCU.