TEMPO.CO, Jakarta - Sadie Sink’s debut in the Marvel Cinematic Universe has become one of the biggest mysteries surrounding Spider-Man: Brand New Day. The Stranger Things star has joined the cast of the upcoming Marvel film, but her character remains undisclosed, sparking months of speculation among fans.
Neither Marvel Studios nor director Destin Daniel Cretton has revealed who Sink is playing. However, the secrecy appears intentional, with Cretton suggesting that revealing her role could spoil a major surprise in the film.
"I wish everything was a secret," Cretton said in an interview with Rolling Stone when asked about keeping Sink’s character hidden. He added that audiences would understand the decision once they see the movie and may even appreciate not knowing beforehand.
Sink has also addressed the speculation without confirming any details. During an interview with Fandango’s Big Ticket, she said she was surprised by the level of fan theories surrounding her role.
"I really like the character and that's all I'll say," Sink said.
4 Fan Theories on Who Sadie Sink Plays in Spider-Man: Brand New Day
With Spider-Man: Brand New Day marking a new chapter for Peter Parker after the events of Spider-Man: No Way Home, fans have developed several theories about who Sink could portray. Here are some of the most discussed possibilities, according to People and Syfy.
1. Jean Grey: The Leading X-Men Theory
The most popular theory is that Sink could play Jean Grey, one of the most iconic members of the X-Men.
Known for her telepathic and telekinetic abilities, Jean Grey has been a central figure in Marvel comics and previous X-Men adaptations. The character was previously portrayed by Famke Janssen in the original X-Men films and by Sophie Turner in X-Men: Apocalypse and Dark Phoenix.
Fans believe Sink could introduce a younger version of Jean Grey as Marvel prepares to expand its mutant storyline. The theory has gained attention because recent MCU projects have increasingly hinted at the arrival of the X-Men.
However, some fans argue that Marvel may not introduce a new version of Jean Grey so soon, especially with the original X-Men characters expected to return in future MCU projects.
2. Gwen Stacy: A Classic Spider-Man Character
Another major theory suggests Sink could play Gwen Stacy, one of Spider-Man’s most important characters in Marvel comics.
Gwen Stacy has been portrayed in previous Spider-Man films, including by Bryce Dallas Howard in Spider-Man 3 and Emma Stone in The Amazing Spider-Man films opposite Andrew Garfield.
The character has also become popular through Spider-Gwen in the animated Spider-Verse films, voiced by Hailee Steinfeld.
Some fans believe the MCU could introduce its own version of Gwen as Peter Parker begins a new phase of his life following No Way Home.
3. Mayday Parker: Peter Parker’s Future Daughter
A more multiverse-focused theory suggests Sink could portray Mayday Parker, also known as Spider-Girl.
In Marvel comics, Mayday is the daughter of Peter Parker and Mary Jane Watson from an alternate timeline. She inherits her father’s abilities and becomes a superhero herself.
The theory has gained attention because the MCU has increasingly explored alternate universes and possible future versions of established characters.
4. Rachel Summers: Another Mutant Possibility
Another fan theory points to Rachel Summers, the daughter of Jean Grey and Cyclops.
Like her mother, Rachel has powerful psychic abilities and plays an important role in X-Men storylines involving time travel and alternate realities.
If Marvel plans to connect Spider-Man: Brand New Day with its growing mutant storyline, Rachel could be another possible direction for Sink’s character.
Other Theories: Black Cat, Spider-Woman and More
Beyond the most popular guesses, fans have also suggested several other Marvel characters, including Felicia Hardy, better known as Black Cat, as well as Spider-Woman, Silver Sable, Betty Brant, and Firestar.
Some have also speculated that Sink could play Karma, a mutant character whose powers involve controlling other people’s minds. However, the theory faces questions because Karma is Vietnamese in the comics, while Marvel has not indicated any connection between Sink’s casting and the character.
For now, Sink’s role remains one of Spider-Man: Brand New Day’s biggest unanswered questions. Whether she turns out to be a mutant, a Spider-Man ally, or an entirely new character, Marvel appears determined to keep the reveal hidden until audiences see the film.
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