Sadie Sink has revealed that years of online fan speculation were her first introduction to the iconic X-Men character. The Spider-Man: Brand New Day star admitted she knew very little about Jean Grey before Marvel approached her. According to Variety, Sadie Sink said she had never watched any X-Men films before taking on the role of Jean Grey. Surprisingly, she only knew about Jean Grey because fans had spent years linking her to the iconic mutant online. However, Marvel has not officially confirmed her involvement beyond Spider-Man: Brand New Day.