Stranger Things star Sadie Sink is officially joining the Marvel Cinematic Universe in Avengers: Secret Wars.
Actress Sadie Sink, best known for her role as Max in Stranger Things, has been confirmed to join the Marvel Cinematic Universe in the upcoming film Avengers: Secret Wars . While her specific character remains undisclosed, fans and industry insiders speculate she may portray a key superhero or multiverse variant, with theories ranging from Jean Grey to Rachel Summers . The announcement has generated significant excitement across social media, with many praising the casting choice given Sink’s critically acclaimed dramatic and action-oriented performances.
A Growing Marvel Presence
Sink’s involvement in the MCU extends beyond Secret Wars. She will first appear in Spider-Man: Brand New Day, scheduled for release on July 31, 2026 . Interestingly, Sink revealed on The Tonight Show Starring Jimmy Fallon that she first learned about her potential casting through online fan theories before receiving an official offer . “Before I got cast in Spider-Man, there was speculation online that said, ‘Sadie Sink is gonna be in the new Spider-Man,'” she explained. “I was like, ‘I am?’ Sure enough, two days later, they asked me to do it” .
Character Speculation
The secrecy surrounding Sink’s role has fueled intense fan speculation. Some rumors suggest her character may initially appear as a minor figure before a third-act reveal identifies her as “Jean,” potentially setting up a Jean Grey introduction for the mutant-filled future of the MCU . Other theories propose she could be playing Rachel Summers, the daughter of Jean Grey and Scott Summers in comic lore . Whatever the case, her casting in Secret Wars indicates her character will have significant importance in the broader Multiverse Saga narrative.
Production Timeline
Avengers: Secret Wars is slated to begin principal photography in London during summer 2026, following the completion of Avengers: Doomsday, which recently wrapped filming . The Russo Brothers are directing both projects, with Secret Wars expected to serve as a culmination of Marvel’s multiverse saga . According to Marvel president Kevin Feige, while Endgame was about endings, “Secret Wars is about beginnings,” potentially resetting and realigning the MCU timeline with the introduction of mutants at the forefront .
What This Means for the MCU
The film represents one of Marvel’s most ambitious projects to date, featuring an ensemble cast that reportedly includes Robert Downey Jr. as Doctor Doom, members of the Fantastic Four, and numerous other heroes across the multiverse . Sink’s addition to this roster suggests her character—whatever identity she assumes—will play a meaningful role in shaping the next era of the Marvel Cinematic Universe. With Spider-Man: Brand New Day arriving July 31, 2026, and Avengers: Secret Wars scheduled for December 17, 2027, fans have much to anticipate from the Stranger Things star’s Marvel journey
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