After wrapping Stranger Things, Sadie Sink is set to join the Marvel Cinematic Universe with Spider-Man: Brand New Day, sparking widespread speculation about her character, according to Deadline.

More recent rumors have suggested Sink is playing Shastra, a multiversal shapeshifter, or other redheaded characters such as Punisher sidekick Rachel Cole-Alves or even Mayday Parker, the daughter of Toby Maguire's Spider-Man variant.

Sink, who is about to reprise her role in Stranger Things 5, will first appear in Spider-Man: Brand New Day, out on July 31, 2026. Avengers: Doomsday will continue that story on December 18, 2026, followed by Avengers: Secret Wars, which starts filming early next year, on December 17, 2027.

Sadie Sink, adored for her role as Max in Stranger Things, is now stepping into the Marvel Cinematic Universe with Spider-Man: Brand New Day. Her casting has set off a wave of excitement and theories online,

But even on her down days, her red hair will remain part of her uniform. “What you hear your entire life as a redhead is to never dye your hair. ‘People pay so much money for that hair.’ So I never have, and I don’t think I will.”

Between season 5 of Stranger Things and her upcoming role in Spider-Man: Brand New Day, Sadie Sink is having, like, a really, really good year. And now that she’s enter the Marvel Cinematic Universe,