Sadie Sink says Spider-Man: Brand New Day introduced Jean Grey as a “hurt teenager,” not a villain, setting up her X-Men future

The biggest mystery surrounding Spider-Man: Brand New Day has finally been answered. After months of speculation, Sadie Sink has confirmed she plays Jean Grey in the Marvel Cinematic Universe, and the actress is now opening up about why this version of the iconic mutant differs significantly from previous adaptations.

Following the theatrical release of Spider-Man: Brand New Day, Sink discussed her Marvel debut in one of her first spoiler-filled interviews, revealing how the film intentionally reimagines Jean Grey before she becomes the heroic X-Men leader fans know from Marvel Comics. Rather than introducing a fully formed superhero, Marvel presents Jean as a traumatized young woman struggling to understand powers that have only brought pain into her life.

The reveal also establishes Jean Grey as one of the central figures in Marvel Studios’ long-term mutant plans, with Sink already preparing for the upcoming X-Men reboot.

According to Entertainment Weekly, Sink described finally being able to discuss the role after keeping Marvel’s biggest secret for more than a year.

Sadie Sink finally discusses joining the Marvel Cinematic Universe

For over a year, fans speculated that the Stranger Things actress had been cast as Jean Grey, but Marvel kept the character’s identity under wraps until Spider-Man: Brand New Day reached theaters.

Speaking to Entertainment Weekly, Sink admitted finally revealing the secret has been a relief.

“It’s good. It’s a big relief.”

She added that living with such a closely guarded secret for so long made the public reaction feel surreal.

“You live with a little secret for so long that, now that it’s out and a lot of people are going to see this movie… it’s surreal.”

The actress also laughed about musician Steve Lacy accidentally revealing her character on the film’s red carpet before the official announcement. Instead of worrying about the spoiler, Sink said she was simply excited that he appreciated Jean Grey.

Marvel’s Jean Grey begins her journey as someone deeply broken

Unlike earlier portrayals of Jean Grey in animation or Fox’s X-Men films, Marvel Studios introduces the character during one of the darkest periods of her life.

In Spider-Man: Brand New Day, Jean becomes entangled in a conflict involving Damage Control after discovering the organization’s connection to the disappearance of her telepathic sister, Sara Grey. The emotional trauma eventually pushes her extraordinary psychic abilities beyond her control, forcing Spider-Man to stop her before New York falls completely under her influence.

Sink explained that what convinced her to accept the role was this entirely different approach to Jean’s origin.

“We were meeting her not at a point where she’s a hero, but at a point where she’s just a hurt, young girl who doesn’t know what her relationship to her power is.”

Rather than portraying a traditional comic-book villain, she focused on Jean’s emotional state.

“Jean Grey is a hero, she’s a good person, but if it takes more to become that… I think that just is so compelling.”

How Sadie Sink created her own version of Jean Grey

Sink revealed she studied previous versions of Jean Grey, including comic books and earlier screen adaptations, but deliberately avoided copying them.

She wanted this performance to reflect the version written specifically for the MCU while developing her own physical interpretation of Jean’s telepathic and telekinetic powers.

Instead of exaggerated gestures often associated with psychic characters, she explained that Marvel’s version emphasizes subtle expressions.

“What I landed on was not looking like much effort at all… It’s more in the eyes because her power is, at least in this movie, invisible.”

She also credited director Destin Daniel Cretton with helping shape Jean as a sympathetic character whose actions stem from grief rather than malice.

Spider-Man ending lays the groundwork for Marvel’s X-Men reboot

While Spider-Man: Brand New Day concludes with Jean leaving New York, the ending clearly positions her as a key player in Marvel Studios’ upcoming X-Men movie.

Sink confirmed she has already met with director Jake Schreier and has been involved in early conversations about the franchise’s future.

“Now that it’s out and X-Men is being talked about and it’s happening, it’s so exciting to think about what’s next for her.”

She also praised Marvel’s decision to introduce a younger generation of mutants.

“I think it was such a smart choice… to start young and have this younger generation of mutants.”

According to Sink, she has already begun participating in chemistry tests with actors auditioning for other mutant roles, helping Marvel establish relationships between future X-Men members before filming officially begins.

Although she declined to address online casting rumors directly, she acknowledged the excitement surrounding the franchise’s future.

As Marvel Studios prepares to launch a brand-new era centered around mutants, Spider-Man: Brand New Day has quietly become the first chapter in what promises to be one of the MCU’s biggest long-term storylines.