Ever since Sadie Sink joined Spider-Man: Brand New Day, Marvel fans have been trying to figure out who she’ll portray in the highly anticipated film. While Marvel remains silent on the matter, several fan theories have emerged online, with a few names consistently leading the conversation.
Is She Playing Jean Grey?
This is arguably the most popular theory among fans.
Many believe Sink’s red hair and acting range make her a perfect fit for Jean Grey, one of the most iconic X-Men characters. Some theories suggest Brand New Day could quietly begin introducing mutants into the MCU, making Jean a major surprise reveal ahead of future X-Men projects.
There are also theories that her character may possess telepathic abilities, potentially explaining how she could remember Peter Parker despite the memory spell cast at the end of Spider-Man: No Way Home.
If Marvel is planning for the long game, introducing Jean Grey in a Spider-Man film would certainly be a major moment.
Jean Grey [credit: Marvel Comics]
Could She Be Mayday Parker?
Another popular fan theory points to Mayday Parker, the daughter of Peter Parker and Mary Jane from an alternate universe.
Fans have speculated that Brand New Day could explore multiverse storylines further, with Sink playing an older version of Mayday or another Parker family member from a different reality.
What About Firestar?
Firestar is another name frequently mentioned by Marvel fans.
The character has ties to both Spider-Man and the X-Men, making her a logical bridge between the two franchises. Sink’s age and screen presence have made her a fan-favorite choice for the fiery superhero.
Could Marvel Surprise Everyone?
Of course, Marvel is known for keeping secrets.
Some fans have floated names like Julia Carpenter, Madelyne Pryor, Rachel Summers, and even entirely original MCU characters. It’s also entirely possible that Marvel is hiding a role nobody has guessed yet.
What Do You Think?
Who do YOU think Sadie Sink will play in Spider-Man: Brand New Day?
- Jean Grey
- Mayday Parker
- Firestar
- Rachel Summers
- Madelyne Pryor
- Someone Else Entirely?
Let us know your theories in the comments. Until Marvel officially reveals her role, the speculation surrounding Sadie Sink’s character is likely to continue.
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