By this point, everyone pretty much knows that Sadie Sink plays Jean Grey in "Spider-Man: Brand New Day." In fact, many were certain of her role before the film even arrived, despite the fact Marvel Studios and Sony Pictures did their best to keep it all a secret. According to Marvel Studios head Kevin Feige, the intent was to preserve audiences' experience at the theater. "Spider-Man: Brand New Day" absolutely ruled the box office, becoming the biggest movie of 2026 in the process. But Sink's "Brand New Day" role and the secrecy surrounding it proved the stupidity of Marvel's spoiler culture.