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Before Jean Grey returned from the dead, legendary X-Men writer Chris Claremont intended to introduce her older sister as part of X-Factor, with a set of mutant powers all her own that would have guided the course of the story.

Speaking at an X-Men writers panel at Terrificon 2026, Claremont says he would have given Jean's older sister the power to find and track mutants like a "living Cerebro," though she would have had to fully hone her powers over the course of X-Factor's run. However, plans changed when Marvel decided to bring Jean Grey back to life.

"My idea was, if you need a fifth person and you need a woman and you need a Grey, Jean had a big sister, and she's a mutant. I've established that. What's her power? She's a living version of Cerebro. She's the one who takes them out and leads them to the mutant they've got to fix or find or whatever," Claremont explains of his reluctance to bring Jean back from the dead. "But she's human. I mean, as a mutant is, and she doesn't know the slightest thing about how to work her power. So, things go wrong. Things go wrong all the time. Sometimes they don't, sometimes they do, sometimes it's good, sometimes it's bad. But it brings tension into every encounter with their target, and leaves Jean out of it until, let's say, a year later or two years later, as we did with killing her."

Jean's sister Sara, introduced in 1980's Uncanny X-Men #136, plays an important role in this summer's smash blockbuster Spider-Man: Brand New Day, providing the motivation for her attacks on Damage Control.

Once Claremont got on board with bringing Jean back to life, he initially pitched a totally different way to handle her return, resurrecting her as her original teenage self, a concept that wouldn't actually make it into X-Men lore until 2012's All-New X-Men, which brought the original five X-Men to the present day in their teenage forms, with the group sticking around for several years.

"You want to bring her back? Fine," says Claremont. "Then we bring her back. But this is Jean as she was in the beginning. 16 years old, 15 years old. in love with Scott. But Scott's a father with two kids, and he looks at and he's like 30 and one of the kids has big shoulder pads and guns."

Claremont is referring to Cable, the son of Madeline Pryor and Scott Summers who was taken to the future as a baby and raised to defeat Apocalypse, a story that partially unfolded in the pages of X-Factor as well as X-Force and which was adapted into season 2 of the X-Men '97 animated series.

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