For months, Marvel fans have been trying to solve one of the biggest mysteries surrounding Spider-Man: Brand New Day (2026): who exactly is Sadie Sink playing?
Since the Stranger Things star joined Tom Holland's fourth solo Spider-Man movie, Marvel Studios and Sony Pictures have kept her role hidden, leading to countless theories about her place in the Marvel Cinematic Universe.
Many fans believe Sink could be connected to Marvel's growing mutant storyline, with popular theories including X-Men characters such as Jean Grey and Rachel Summers.
With several actors from Fox's X-Men movies returning for Avengers: Doomsday (2026), speculation continues to grow.
Others wonder whether Sink could instead be playing a character from Spider-Man's own comic book history. Now, after months of speculation, the mystery has finally been solved.
Related: ‘Spider-Man' Director Speaks Out After Marvel Pulls the Plug on Film
Many Fans Already Know Who Sadie Sink Plays in Spider-Man
Following the film's world premiere at the Dolby Theatre in Hollywood, select attendees have discovered the identity of Sadie Sink's mysterious character ahead of the movie's July 31 theatrical release.
For many, the reveal brings an end to one of the biggest unanswered questions surrounding the upcoming Marvel Studios and Sony Pictures collaboration.
Premiere attendees have now seen the film; however, Marvel and Sony are continuing to keep the movie's biggest surprises under wraps ahead of its worldwide release.
While social media reactions to the film have begun, full critic reviews remain under embargo until July 28, meaning general audiences will soon discover Peter Parker's next chapter for themselves.
With that said, musician Steve Lacy, who has a song for the film titled “oh yeah?,” did spoil the identity of Sink's character on the red carpet.
Directed by Destin Daniel Cretton, Spider-Man: Brand New Day follows the events of Spider-Man: No Way Home (2021), which left Peter Parker alone after the world forgot his identity.
Tom Holland returns as Peter Parker, alongside Zendaya as MJ and Jacob Batalon as Ned Leeds. The cast also includes Jon Bernthal as Frank Castle/The Punisher, Mark Ruffalo as Bruce Banner/Hulk, Tramell Tillman as Bill Metzger, and Michael Mando as Mac Gargan/Scorpion.
The movie arrives shortly before Marvel Studios' next major crossover event, Avengers: Doomsday, which hits theaters in December 2026 and features a huge lineup of returning MCU heroes and characters from across Marvel history.
Spider-Man: Brand New Day swings into theaters on July 31, 2026.
Who do you think Sadie Sink is playing in Spider-Man: Brand New Day? Share your theories with us in the comments below!
