Sadie Sink’s Spider-Man role has not been officially revealed yet, so there is no confirmed answer to who she plays in the movie.

What is officially known?

  • Sadie Sink has been cast in the next Tom Holland Spider-Man movie, currently referred to as Spider-Man: Brand New Day (often called Spider-Man 4 in reports).
  • Marvel and Sony have not publicly announced her character’s name or identity, keeping it deliberately secret.
  • Interviews and reports describe her part as a significant, recurring role that may connect into larger MCU events like Avengers: Secret Wars.

Popular fan theories

Since there is no confirmed character, most of what you see online is speculation and set‑photo guessing.

Common theories include:

  • A Spider-Man–related heroine like Gwen Stacy or a version of Mayday Parker , based on age and some set descriptions.
  • A mutant/X‑Men character like Jean Grey , tied to early insider chatter and later reports about her appearing in future ensemble films.
  • A more grounded, street‑level character such as Rachel Cole-Alves (linked to Punisher stories), which fits rumors that the film leans into grittier crime plots.

Why there’s still no clear answer

  • Sadie Sink has joked that “hair color can change,” hinting that her red hair and later blonde look are being used to misdirect fan theories.
  • Studio secrecy around her character name and the way leaks are handled suggest the reveal is meant to be a major plot point rather than simple casting info.

So, as of now, the accurate reply to “who does Sadie Sink play in Spider-Man?” is: her character remains officially unconfirmed, with only fan theories and rumors pointing to possibilities like Gwen Stacy, Jean Grey, Firestar, Rachel Cole-Alves, or a multiversal Mayday Parker.

Information gathered from public forums or data available on the internet and portrayed here.