A new promotional video for Spider-Man: Brand New Day has reignited speculation over Sadie Sink’s secret role in the upcoming Marvel film.
With the movie set to release on July 31, Sony Pictures shared a playful clip featuring the Stranger Things star, continuing the studio’s campaign of keeping her character under wraps.
The official Spider-Man movie account posted the video with the caption, “Coming clean.” The clip included the on-screen text: “Preparing for the documentary on how I kept my Spider-Man character secret.”
The lighthearted video quickly attracted attention from Marvel fans, many of whom believe they have already figured out Sink’s role.
Jean Grey remains the leading theory
The most widely discussed fan theory is that Sadie Sink will portray Jean Grey, one of the X-Men’s most iconic characters.
Social media users flooded the comments with confident predictions, with many insisting the mystery is already solved despite Marvel and Sony offering no official confirmation.
Others, however, believe Sink could be playing Firestar, a mutant superhero closely associated with Spider-Man in Marvel comics who has yet to make a major live-action film appearance.
Sadie Sink Teases Mystery ‘Spider-Man’ Role
Some fans also shared humorous theories, joking that the actress could even be playing Professor Charles Xavier, highlighting the excitement surrounding the mystery.
Marvel stays silent
Neither Marvel Studios nor Sony Pictures has revealed the identity of Sink’s character, continuing the studios’ long-standing practice of keeping major casting details secret until a film’s release.
The mystery has become one of the biggest talking points surrounding Spider-Man: Brand New Day, with fans analysing every trailer, interview and promotional clip for clues.
Answer arrives on July 31
While speculation continues to grow, there is still no official confirmation about Sadie Sink’s role.
Whether she joins the Marvel Cinematic Universe as Jean Grey, Firestar, or an entirely different character, audiences will discover the truth when Spider-Man: Brand New Day arrives in theatres on July 31.
