The Marvel Universe has plenty of hellish dimensions to pull from in modern stories. Limbo has even become a pronounced element in the current comics thanks to its newly established embassy in New York City. But there's one timeline in the multiverse that highlights how bad things might have gone if demons had fully invaded the superhero-filled city, all while fully embracing a far more terrifying tone than superheroes of the time were used to.
Source：https://www.cbr.com/halloween-what-if-x-men-inferno-marvel/
