Marvel kept Sadie Sink’s Jean Grey casting in Spider-Man: Brand New Day notoriously under wraps ahead of the movie’s release. In a recent interview with Variety, Sink shared that she told a few close people that she had been cast as Jean Grey in the film. Besides the actress’s family members, her Stranger Things directors, Matt and Ross Duffer, also knew the closely guarded secret. Why Sadie Sink chose to share the secret with three peopleVariety recently asked Sadie Sink who the three people she told about her Jean Grey role were. The Stranger Things star also revealed how the Duffer brothers reacted after finding out about her Jean Grey casting.