Spider-Man: Brand New Day finally introduced the MCU's version of a major X-Men character by bringing Sadie Sink's Jean Grey into Spider-Man's story. She's initially the villain in the new movie, using her powers to hope between innocent people as she tries to infiltrate Damage Control.
It's a pretty brutal power and one that causes a lot of hurt along the way, breaking Peter Parker's heart when she pretends to be MJ, causing Bruce Banner to become the Hulk once again, and seemingly hurting a fair few of New York City's civilians too. However, now the movie's screenwriters have clarified that there's one line that Grey does not cross in the movie.
