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Sadie Sink Joins Spider-Man 4 Cast, Role Sparks Speculation About Marvel Character

The Stranger Things star has been cast in an undisclosed role, fueling theories about her potential portrayal of Jean Grey or other Marvel characters.

Promo image for "Spider-Man: No Way Home." The film has been getting ecstatic audience reactions.
Sadie Sink at SXSW 2025 for O'Dessa
Sadie Sink and Spider-Man
Image

Overview

  • Sadie Sink, known for her role in Stranger Things, has been confirmed to join the cast of Spider-Man 4, slated for release next year.
  • Her role in the film has not been disclosed, leading to widespread fan speculation about which Marvel character she might portray.
  • Theories include Jean Grey, a key X-Men character, as well as Firestar, Julia Carpenter (Spider-Woman), or even an alternate version of Mary Jane Watson.
  • The timing of her casting aligns with rumors that Marvel is seeking younger actors for the X-Men reboot, though no official confirmation links Sink to Jean Grey.
  • Spider-Man 4 is positioned between major MCU events, Avengers: Doomsday (2026) and Avengers: Secret Wars (2027), and may explore multiverse storylines.