Now that Sadie Sink's mystery Spider-Man character is returning for Avengers: Secret Wars, there's added support that she's playing one of two roles.

Earlier this year, Marvel confirmed that Stranger Things star Sadie Sink would be joining the cast of Spider-Man: Brand New Day. This kicked off endless online speculation about which iconic character she might play,

For starters, a number of Marvel Cinematic Universe mainstays are seemingly sitting out Avengers: Doomsday, not securing a chair for themselves at the big cast reveal. Mark Ruffalo, Brie Larson, and Benedict Cumberbatch are all surprising omissions.

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 has reportedly joined the cast of another Marvel film, Avengers: Secret Wars, after being cast in Spider-Man: Brand New Day. However, Marvel Studios has not yet confirmed this casting. Sink was announced as a part of the cast of Spider-Man 4 alongside Tom Holland,

Stranger Things star Sadie Sink is reportedly is set to reprise her mystery MCU role from the pcoming Spider-Man: Brand New Day role in Avengers: Secret Wars . The report came from Deadline , who said that Sink would begin shooting the film later next year.

Secret Wars after Spider-Man 4! This report is coming from @Deadline, she will first appear in her to-be-confirmed role in Spider-Man: Brand New Day on July 31st, 2026! Secret Wars hits theaters on December 17th,