In a casting shocker that no one saw coming, Stranger Things star Sadie Sink is swinging into the Marvel Cinematic Universe (MCU), joining Tom Holland in the highly anticipated Spider-Man 4. The announcement has sent the internet into a frenzy, with fans scrambling to figure out exactly who Sink will be playing—and how her character will shake up Peter Parker’s world.
Marvel’s Best-Kept Secret: Who Is Sadie Sink Playing?
Marvel Studios has refused to spill the details on Sink’s role, fueling speculation that she’s not just any side character. The two hottest theories making the rounds are:
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Mary Jane Watson – Is Marvel finally introducing the classic MJ into the MCU? With Zendaya’s Michelle Jones already established as Peter’s love interest, Sink stepping in as Mary Jane could ignite a love triangle or even hint at a multiversal twist.
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Jean Grey – Could Spider-Man 4 serve as a bridge to the X-Men? Sink has long been a fan-favorite to play Jean Grey, and her red hair only adds fuel to the fire. If Marvel is using this film to softly introduce mutants, this casting could be bigger than anyone expected.
What We Know About Spider-Man 4
Production for Spider-Man 4 is set to kick off later this year, with director Destin Daniel Cretton (best known for Shang-Chi and the Legend of the Ten Rings) at the helm. The film is rumored to set up a darker, more grounded chapter for Peter Parker after the multiversal chaos of No Way Home.
Marvel has confirmed a July 31, 2026 release date, giving Sink plenty of time to train for whatever superpowered—or super emotional—role she’s taking on.
Fans Go Wild Over Sadie’s MCU Debut
The internet erupted with excitement over Sink’s casting, with Marvel diehards and Stranger Things fans alike celebrating the actress’s leap into superhero cinema. Her ability to balance raw emotion and action-packed intensity makes her a natural fit for the MCU, and fans are already debating whether she’ll be throwing punches as a mutant or breaking hearts as Peter Parker’s next great love.
A New Era for Spider-Man?
Sink’s addition to the cast suggests that Marvel has big plans for the next phase of Spider-Man’s story. Whether she’s a love interest, an ally, or a future X-Men leader, one thing is certain—her presence alone has made Spider-Man 4 one of the most anticipated superhero films in years.
Now, the only question left is: Will she wear the classic Mary Jane red, or will she be unleashing Phoenix-level powers? Fans will have to wait until 2026 to find out.