Thanks to Avengers: Infinity War and Endgame, there are now a substantial number of vacant slots in the Marvel Cinematic Universe (MCU) superhero collective. Lots of mainstay superheroes have left and that can only mean one thing: Replacements! It seems every decade or so, the MCU's Avengers become a rotating door of old and new faces, and it's high time some new superheroes join the group.