Sadie Sink Joins Spider-Man 4, Sparking Speculation About Her Role

The Stranger Things star's casting has fueled fan theories about her potential character, including Gwen Stacy and Firestar.

Sadie Sink has been officially cast in the upcoming Spider-Man 4, set for release on July 31, 2026, though her role remains undisclosed.
Fans have speculated that Sink could portray characters such as Gwen Stacy, Firestar, or even a new version of Mary Jane Watson, given her red-haired appearance.
Some theories suggest her casting could connect the MCU Spider-Man films with the animated Spider-Verse movies, possibly introducing Spider-Gwen to live-action.
Other fan discussions include the possibility of Sink playing an X-Men character, such as Jean Grey, though no official confirmation supports this idea.
Spider-Man 4 will be directed by Destin Daniel Cretton and is expected to bridge significant multiverse storylines leading into Marvel's Avengers: Secret Wars.