For months, there were rumors that Sadie Sink had been cast as the X-Men’s Jean Grey in Spider-Man: Brand New Day. But, in truth, you didn’t need a sense of surprise for the scene to land; Sadie Sink’s Jean Grey was a powerhouse, and her official MCU debut is perfect X-Men setup. Sink is delighted with Marvel and Sony’s approach, which gave Jean Grey a new origin story. That makes sense, because Jean Grey is really relegated to the third act; for the bulk of the film, viewers see Jean acting through the bodies of others. Jean Grey has always had her dark side.