Ever since Sadie Sink was cast in Spider-Man: Brand New Day, her character’s identity has been a closely guarded secret. The most popular theory was that she was the MCU’s version of the iconic X-Man, Jean Grey. But other theories persisted, like the mutant Firestar, or even Jean Grey’s daughter, Rachel Summers. But, as it turns out, the earliest theory was the correct one. Sadie Sink is indeed the MCU’s Jean Elaine Grey, one of Marvel Comics’ most powerful mutant telepaths. But there are significant differences between comic book Jean, the Fox X-Men movies Jean, and our new Marvel Cinematic Universe version.
How Brand New Day Introduces the MCU’s Jean Grey
In Spider-Man: Brand New Day, Spidey (Tom Holland) works with the Department of Damage Control to help capture a powerful psychic who has been committing terrorist acts against the government agency. This mysterious person has the power to psychically jump into different bodies and take them over, usually from a distance of no more than 33 feet away. Although she’s the antagonist, by the movie’s third act, Peter Parker realizes that Jean is attacking Damage Control because they kidnapped her equally psychic sister Sara, and she wants her back.
When Damage Control ultimately captures Jean, she finds out that her sister Sara died under their imprisonment, and then truly unleashes her telepathic power on much of New York City in a rage. She attempts to kill the DODC’s William Metzger (Tramell Tillman), but Peter Parker appeals to her better nature, and stops her from murdering him in cold blood. She then goes off to parts unknown, although it certainly appears the bus she gets on is heading toward upstate New York, famously the home to Charles Xavier’s School for Gifted Youngsters.
Marvel Comics’ Jean Grey Was Not as Powerful as a Teenager
In the comics, Stan Lee and Jack Kirby introduced Jean Grey as Marvel Girl in 1963’s X-Men #1. But early on, she was only a telekinetic, not a telepath. When Professor X faked his death in 1968’s X-Men #43, we learned Jean was also a telepath. However, Professor X had blocked her telepathy when she was younger, as the power was overwhelming to her. Her powers began to manifest as a child, when she telepathically linked to her friend Annie, and she was mentally tethered to her when she died in an accident.
With Xavier gone, Jean became the X-Men’s resident telepath, and flexed both of her mental powers. But it wasn’t until Jean became the Phoenix in Uncanny X-Men #101 that the true extent of her telepathy shone through. Readers soon discovered she was one of the most powerful minds in the Marvel Universe. Over the years, Phoenix or no Phoenix, Jean Grey’s mental powers classify her as an Omega-level mutant.
Sadie Sink’s Jean Grey Is Already an Omega-Level Mutant Telepath
In the MCU, Jean is clearly already an Omega-level mutant as a teenager. This version of Jean had never met Professor Xavier, so no psychic blocks were ever placed on her. That’s something even Patrick Stewart’s Xavier did to his Jean, played by Famke Janssen. And this new Jean has already flirted more than once with her dark side in Brand New Day. We won’t have to wait for a Dark Phoenix Saga: Take 3 for that one. Will whatever version of Professor Charles Xavier she meets try to limit her powers, possibly for her own good? From what we know from both the comics and the original X-Men films, that never works out for anyone. But we can’t wait to see just how far Sadie Sink’s Jean will take it in future MCU installments.
Director Destin Daniel Cretton WANTED to Include Jean Grey in Spider-Man: Brand New Day, It Wasn’t a Mandate
In a recent interview with The Wrap, director Destin Daniel Cretton revealed that Sadie Sink’s Jean Grey joined Spider-Man: Brand New Day at his request, not because Marvel Studios mandated it for the franchise’s future. He noted, “It was not a mandate, it was a request. We asked.”
Cretton went on to reveal, “Even though this movie does have many characters in it, the design of it was to make sure that every character that’s in this was a reflection of his journey and had a very clear reason to be there, because of Peter.” And that definitely shows in the way Jean Grey’s Marvel debut is woven into the tale of this Spidey movie.
Sadie Sink Confirms Jean Grey Will Be Back, But Notes She Hasn’t Met Any Other X-Men Castmates
In an interview, Sadie Sink confirmed Jean Grey would return in Jake Schreier’s X-Men movie, but noted she didn’t know of any other X-Men cast to play her teammates.
Sink offered of Jean Grey, “Yes, she will [be back in X-Men]. It’s been really exciting all the conversations we’ve had, and I feel really lucky that I have this introduction through “Spider-Man” and [her] backstory. I think that’s what X-Men is all about, too. The more I’ve gotten into it and researched, what makes them special is that they are all incredibly flawed and maybe have done bad things. That makes them more compelling, complex characters and a more complex hero if they don’t start out that way. And they have to find their relationship to their powers. Because it’s not like they’ve asked for this or that these strengths make their lives easier; they make them a lot harder, actually. So, knowing Jean’s struggle will be important in the future of her character and where she goes, just makes her really well-rounded, which I’m excited for.”
But also that she hasn’t met any other X-Men and cannot confirm Kit Connor as Cyclops or Samara Weaving as Emma Frost. “I have not,” Sink says, “but I hope to very soon. I love the idea that it’s going to be a really awesome ensemble. I can’t wait. I’m getting super, super pumped about it.”
Spider-Man: Brand New Day, directed by Destin Daniel Cretton, and starring Tom Holland, Zendaya, Sadie Sink, Jacob Batalon, Jon Bernthal, Mark Ruffalo, and Tramell Tillman, is now playing in theaters everywhere.
Originally published on July 30, 2026.