- Primary Subject: Spider-Man: Brand New Day - Sadie Sink Mystery Role
- Key Update: Red carpet slips from the premiere have sparked major speculation about Sadie Sink's long-kept secret Marvel role.
- Status: Leaked
- Last Verified: July 28, 2026
- Quick Answer: Red carpet comments at the premiere suggest Sadie Sink's mysterious role is key to the film, though Marvel Studios has not officially confirmed her identity.
Just before Spider-Man: Brand New Day hits theaters worldwide, it appears the cat is finally out of the bag, as the film's red carpet event may have revealed Sadie Sink's mysterious role.
A year after the Stranger Things breakout star was announced as part of the cast, details about her character have remained tightly under wraps.
Now that the film is about to be released, has Sink's Brand New Day character finally been spoiled?
Who Does Sadie Sink Play in Spider-Man: Brand New Day?
There have been several rumors surrounding who Sadie Sink plays in Spider-Man: Brand New Day, and it appears one of those theories may have been true all along.
Singer-songwriter Steve Lacy, whose song "oh yeah?" is featured on the film's official soundtrack, attended the movie's red carpet premiere at the Dolby Theatre in Los Angeles, where he was asked about his favorite character.
Despite being explicitly warned not to spoil anything, Lacy appeared to let a major detail slip.
"Jean. I like Jean. She's the villain, but there's a reason to her madness. I like her. I like her character," he said.
While Marvel Studios has yet to confirm the accuracy of Lacy's comment, it may explain why Sink has long been rumored to be playing the X-Men's Jean Grey in Brand New Day. If his revelation is true, the mystery surrounding her role may finally be over.
Regardless of who Sink ultimately plays, Fandango's Erik Davis has already teased that the long-kept secret is worth the wait, saying the "mystery absolutely pays off" and that Sink is "perfect" in the role.
Critics React to Sadie Sink’s Role in Spider-Man: Brand New Day
While Sadie Sink's role hasn't been officially revealed yet, fans and critics who have already seen Spider-Man: Brand New Day have nothing but praise for The Whale actress.
Writer and cultural critic George McKay described the 24-year-old star as "the newest and greatest star of the MCU," saying her character delivers one of the most "thought-provoking" performances ever featured in a Marvel film.
"Can't wait to see what they do next with her," he wrote.
Editor and film critic Edward Douglas may have had a more mixed review of Brand New Day, but he still called Sink "some of the most inspired MCU casting" since Tom Holland.
Film and TV critic Tessa Smith may have celebrated the reunion of Holland, Zendaya, and Jacob Batalon on the big screen, but she appeared to be even more impressed by Sink's performance, saying she steals "every scene she is in."
Meanwhile, X user furyofthegodz said the film didn't truly come alive until Sink's character "announces herself to the world and changes the course of the franchise's future."
Finally, the mystery will soon be solved when Spider-Man: Brand New Day hits theaters on July 31.
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