Warning: Spoilers ahead for Spider-Man: Brand New Day.
Spider-Man: Brand New Day uses one of Marvel’s less familiar characters to make a surprisingly large change to established X-Men history. The film’s reveal may have been anticipated by some viewers, but its consequences extend beyond the immediate story.
Sadie Sink plays Jean Grey, the original X-Men member known for telepathy and telekinesis. Jean initially appears to be an antagonist, yet the film eventually shows that her actions are driven by an attempt to save her sister, Sara Grey, from the Department of Damage Control.
Who is Sara Grey in Spider-Man: Brand New Day?
Sara Grey, played by Olivia Booth-Ford, has existed in Marvel Comics since 1980. She has remained a peripheral figure, appearing only occasionally in the X-Men books and making brief appearances in X-Men: The Animated Series and X-Men: Evolution.
In the comics, Sara—also sometimes written as Sarah—first appeared in X-Men #136 in May 1980. She was present at Jean’s funeral following the Phoenix Saga. Unlike her famous sister, Sara was not a mutant: she was an ordinary woman living in Albany, New York, with her husband and two children.
Sara’s history with Jean later became much stranger. A suppressed memory resurfaced after Jean’s death, revealing that the sisters had once been kidnapped by the Atlantean Attuma and changed into water-breathers.
Jean defeated Attuma and soon returned to normal. Restoring Sara’s biology was more difficult, requiring Jean to rebuild her sister’s body before they could safely return to the surface. The effort severely drained Jean’s powers and caused her to collapse.
Moved by the recovered memory, Sara became a supporter of mutant rights. That advocacy put her in danger. Anti-mutant activists abducted her and delivered her to the techno-organic alien collective known as the Phalanx, which absorbed her into its hive mind.
Sara’s family later suffered an even greater tragedy. Shi’ar Death Commandos came to Earth to eliminate the Grey bloodline and prevent the Phoenix from returning. Sara’s children, her parents, Jean’s other three siblings and the other targeted family members were killed.
Those relatives remained dead. Sara, however, eventually returned—and no longer as an entirely human character.
What powers does Sara Grey have?
A 2025 comic brought Sara back through Jean’s connection to the Phoenix Force. Her resurrection gave her a mutant ability to detect the powers of other mutants and unlock those abilities.
Although that power set was only realised in print in 2025, it had a much older origin. X-Men writer Chris Claremont proposed Sara as a potential member of the first X-Factor line-up in the mid-1980s.
The film changes Sara’s presentation by making her psychic, giving her abilities that resemble Jean’s. That choice also creates a link to her comic-book power: Sara helps Jean understand and direct her potential rather than simply standing apart from the action.
How does Sara Grey affect the film?
A flashback shows the sisters dealing with the pain of their mother leaving them. Sara teaches the younger Jean to control people’s minds and move from one person to another. Later, when Damage Control abducts Sara, she uses her abilities to protect Jean.
That relationship helps explain why Jean’s motives are more complicated than her early scenes suggest. Sara is not merely a hidden family connection; she is the emotional reason Jean takes the risks she does, while her powers introduce a significant new status change to the Marvel Cinematic Universe.
It may be unlikely that Sara returns in the Marvel Cinematic Universe, but Spider-Man: Brand New Day gives a relatively obscure X-Men character a meaningful role. For longtime readers, the adaptation also echoes Sara’s importance in several of Jean Grey’s strongest stories.
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Spider-Man: Brand New Day is now in cinemas.
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