Although Ms. Marvel gave the MCU its first confirmed mutant, it was Spider-Man: Brand New Day that gave the public its first real look at mutants run amok, and it does it brilliantly. Videos by ComicBook.comMarketing for Spider-Man: Brand New Day kept things under wraps when it comes to Sadie Sink’s character, but plenty of people correctly deduced that she was playing Jean Grey. The way Jean Grey is utilized explains why the civilians of the MCU are likely to be scared of mutants. They’re already on the defensive, but the events of Spider-Man: Brand New Day bring a new terror with the arrival of Jean Grey. The events of Spider-Man: Brand New Day set the stage for mutants to be hated, which could be the driving force of future phases in the MCU.