Sadie Sink Joins Spider-Man 4: Who Could She Be Playing in the MCU?
The MCU’s Spider-Man 4, set for release in July 2026, is already one of the most highly anticipated films of Marvel’s next phase. Now, reports confirm that Stranger Things star Sadie Sink will be joining Tom Holland’s Peter Parker, sparking major speculation about who she could be playing.
With rumors that Spider-Man 4 may blend street-level crime with multiversal elements and even introduce the X-Men, Sink’s casting could be pivotal. But which character will she take on?
Who Could Sadie Sink Play in the MCU?
1. Jean Grey
The most popular theory is that Sink will be the MCU’s Jean Grey, one of the most powerful and well-known members of the X-Men. This would make Spider-Man 4 an unexpected but exciting launching point for Marvel’s mutants, potentially setting up their larger introduction ahead of the rumored X-Men film in 2027.
While it would be unusual to debut such a major X-Men figure in a Spider-Man movie, Marvel could use this as a way to gradually weave mutants into the MCU instead of introducing them all at once.
2. Mary Jane Watson
Since Sink is a natural redhead, she could be cast as Mary Jane Watson, one of Peter Parker’s most iconic love interests. However, this would be a controversial move since Zendaya’s Michelle Jones (“MJ”) has already filled a similar role in the MCU.
If Spider-Man 4 moves Peter toward a new romance, introducing a classic character like Mary Jane could make sense. However, with Zendaya expected to return in a limited capacity, Marvel may choose to avoid potential backlash by keeping Sink’s character separate from the MJ name.
3. Gwen Stacy / Spider-Gwen
Another major love interest from the comics, Gwen Stacy, is a strong possibility for Sink. Many fans have long speculated that Gwen will be introduced in the next Spider-Man trilogy, especially after No Way Home referenced her tragic The Amazing Spider-Man 2 fate.
If Marvel wants to take a bold approach, Sink could play Spider-Gwen, a multiversal version of Gwen Stacy who has her own Spider powers. This would connect to the rumored Spider-Verse elements of the film and give Holland’s Peter a new superhero ally.
4. Felicia Hardy / Black Cat
If Spider-Man 4 leans into street-level crime, Felicia Hardy (aka Black Cat) would be a perfect fit. A skilled thief and sometimes love interest for Spider-Man, Black Cat has been rumored for years, and Sadie Sink could bring the character to life in a fresh, exciting way.
Rumors have linked Scream actress Mikey Madison to this role, but nothing has been confirmed. If Sink takes on Felicia Hardy, it could give Peter a new dynamic beyond his past relationships, possibly setting up a cat-and-mouse romance with deeper layers.
5. Kitty Pryde
If Sink is playing a mutant, she could be Kitty Pryde, the X-Men member with phasing abilities. Kitty is often depicted as younger than Jean Grey, which could make her a better fit for Sink’s age and allow her to be a long-term player in the MCU’s mutant saga.
Kitty also has strong connections to Spider-Man in the comics, as she’s been one of his close allies. Introducing her in Spider-Man 4 could set her up as a key figure before she transitions into X-Men films.
6. Firestar
A lesser-known but interesting option is Firestar (Angelica Jones), a character who was originally created for the Spider-Man and His Amazing Friends cartoon but later became part of the X-Men and Avengers. Firestar has connections to both Spider-Man and the mutant world, making her a unique bridge between storylines.
If Spider-Man 4 subtly introduces mutants without going all-in on the X-Men yet, Firestar could be a good candidate for Sink.
What This Means for Spider-Man 4
While Sadie Sink’s role is still a mystery, her casting hints at a major development in the MCU. Whether she plays an X-Men character like Jean Grey or a classic Spider-Man figure like Mary Jane or Gwen Stacy, her involvement adds another layer of excitement to the film.
