Marvel fans got a big surprise when it was reported that Sadie Sink, the star of Stranger Things, is joining the cast of the upcoming Spider‑Man: Brand New Day. But here’s the big question: who is she playing?
Let’s dive into the possibilities — and why her role might be a major game-changer in the Spider-Man universe.
What We Know So Far
Officially, Marvel and Sony haven’t revealed Sadie Sink’s character. Her casting was confirmed, but no details about her role have been announced. That’s sparked a lot of buzz, speculation, and theories online — especially because this new Spider-Man movie is said to have a darker, more emotional storyline.
Fan Theory #1: Gwen Stacy
Many fans believe Sadie Sink could be the MCU’s version of Gwen Stacy, a character with deep roots in Spider-Man comics.
Gwen is often portrayed as Peter Parker’s love interest — and her story is famous for its tragic twist.
After MJ forgets Peter due to the ending of No Way Home, Gwen could enter his life as a new connection.
Sadie has the perfect look and acting depth to pull off a bold, emotional Gwen storyline.
But is Marvel ready to introduce Gwen when MJ (played by Zendaya) is still around? That’s the debate.
Fan Theory #2: A Spider-Woman Variant
Some speculate Sadie might play a Spider-Woman or alternate version of Spider-Gwen — especially after the success of the animated Spider-Verse movies. This would bring more action, a multiverse twist, and give Sadie a superhero role of her own.
Marvel has already hinted at variants and multiverse stories.
A Spider-powered Gwen from another reality could open doors to crossover events in the future.
This role would also allow Sadie to join the action scenes, not just serve as a love interest.
Fan Theory #3: A Brand New Character
Marvel sometimes creates original roles not found in the comics. Could Sadie be playing someone totally new?
• A new neighbor?
• A friend-turned-foe?
• A young villain?
Whatever it is, her character could reflect the theme of “Brand New Day” — a fresh start for Peter Parker with new allies or enemies.
Why Sadie Sink Is a Perfect Fit
Sadie proved in Stranger Things that she can handle intense emotions, complex characters, and dramatic moments. Whether it’s heartbreak, loss, or bravery — she delivers. That’s why fans are excited.
In a story where Peter Parker has been forgotten by everyone and is rebuilding his life, Sadie’s character could play a powerful emotional role.
Final Thoughts
Sadie Sink’s casting adds mystery, excitement, and star power to Spider‑Man: Brand New Day. Whether she’s Gwen Stacy, a multiverse hero, or something entirely new — one thing’s for sure: her role is going to matter.
Until Marvel gives us the full reveal, all we can do is speculate, rewatch the trailers, and stay tuned.