HighlightsA red carpet interview at the Spider-Man: Brand New Day premiere appeared to reveal Sadie Sink’s role. Sadie Sink has been at the center of speculation since joining Spider-Man: Brand New Day, with Marvel carefully avoiding any confirmation of the character she portrays. That changed when musician Steve Lacy, who contributed music to the film, appeared to identify the character while speaking on the premiere red carpet. Why fans already expected Sadie Sink to play Jean GreyBefore the premiere, widespread speculation had already linked Sadie Sink to the role of Jean Grey, though Marvel had never publicly confirmed the casting. What happens next for Sadie Sink and Spider-Man: Brand New DayThe discussion surrounding Sadie Sink has intensified following the premiere, but Marvel itself has not officially confirmed her character despite the widespread speculation.