Hitting theaters later this year is Avengers: Doomsday, which looks to be one of the biggest events in superhero history. While previous Avengers movies like Avengers: Infinity War and Avengers: Endgame featured an extensive roster of Marvel Cinematic Universe favorites, Doomsday is even folding long-gone characters into the mix. Before then, though, we'll be getting Spider-Man: Brand New Day, which has also inspired speculation about what MCU favorites could be featured in the adventure.