Sadie Sink Breaks Her Silence — The Truth About Her Secret Marvel Role Shocks Fans

As excitement builds around Marvel’s Spider-Man: Brand New Day, actress Sadie Sink is addressing the persistent rumors surrounding her mysterious role in the upcoming film. Fresh off wrapping the final season of Stranger Things, Sink is officially entering the Marvel Cinematic Universe, and speculation has exploded online over who she might be playing.

In a recent conversation with Entertainment Weekly, Sink acknowledged the chaos surrounding fan theories — especially those linking her red hair to certain well-known Marvel characters.

Fans Suspect Jean Grey — Sink Sets the Record Straight

Among the loudest rumors is the assumption that Sink will portray Jean Grey, one of the most iconic members of the X-Men. The speculation escalated quickly the moment Sink’s casting surfaced, but the actress insists she was as surprised as anyone.

“That was happening before I even knew that I would be working on this project,” she said. “I was like, ‘Wait! What are people talking about?’”

Sink also pointed out that fans may be looking too closely at small details, including hair color:
“A lot of people forget that hair color can change.”

Although she carefully avoided confirming or denying any character identity, she encouraged audiences to stay patient.
“People will just have to wait and see. I’m excited for all of it to maybe be put to rest.”

Confirmed for Two Major Marvel Films

Beyond Brand New Day, Sink is set to reprise her mystery role in Avengers: Secret Wars, which will film in London in 2026. With the movie expected to unite major characters across the MCU and multiverse arcs, her involvement implies a significant storyline.

Deadline previously confirmed her casting earlier this year. She joins an A-list ensemble including:

• Tom Holland (Peter Parker)

• Zendaya (MJ)

• Jacob Batalon

• Mark Ruffalo

• Jon Bernthal

• Liza Colón-Zayas

• Tramell Tillman

• Michael Mando

• Marvin Jones III

Marvel Studios has kept details under intense secrecy, adding fuel to theories that Sink may be portraying a character with major long-term impact.

From Hawkins to the MCU

Sink became a breakout star in Stranger Things, where her performance as Max Mayfield earned widespread acclaim. With the final season wrapped, the transition to blockbuster superhero films marks a new chapter for the 22-year-old actress.

Both Spider-Man: Brand New Day and Avengers: Secret Wars are expected to play critical roles in shaping the next era of the MCU.

For now, Sink is keeping quiet — but fans are more curious than ever.