Now official: Sadie Sink's Jean Grey joins Marvel’s X-Men reboot (duh)
With more of the X-Men cast still to come, the reboot already has a likely lead — and it’s probably not the one you had in mind.
The X-Men's long-awaited entrance into the MCU just got a whole lot clearer — and, if you're keeping score, this one's been hiding in plain sight. After a year of wild speculation, fans have finally got confirmation: Sadie Sink is your next Jean Grey. About time, really.
Spider-Man: Brand New Day arrived in cinemas in July 2026 and doubled as Marvel Studios’ official introduction for Sadie Sink’s Jean Grey.
Here’s how it unfolded: the same day Spider-Man: Brand New Day started its theatrical run, word dropped that Samara Weaving is stepping in as the telepathic mutant Emma Frost. Not long ago, Kit Connor landed the part of Scott Summers — better known in comic circles as Cyclops, and, let’s be honest, Jean Grey’s all-time iconic love interest. So, in a matter of weeks, Marvel’s tipped its hand: the X-Men are not only arriving, but casting for the core is well underway.
The MCU’s Mutant Game Plan
You can draw a (very mutant-friendly) dotted line between all these casting reveals and Kevin Feige’s not-so-subtle hints about Marvel’s future plans. Despite Brand New Day being billed as one of the Multiverse Saga’s final acts, it’s now blindingly obvious that Marvel’s next era — let’s call it the Mutant Saga — is getting set up piece by piece. Feige’s been open about having MCU plans until at least 2042, and with the X-Men's deep back catalogue, that’s almost plausible.
There’s something clever going on with the world-building too. Jean Grey turns up in Brand New Day at a point where mutants do exist, but they aren’t split into neat little teams: no X-Men, Brotherhood, or Acolytes running around just yet. It’s not a universe that’s lived through all the classic mutant turmoil — the big stories are still on the table. Even the timeline fits neatly: adamantium (hello, Wolverine) was only just introduced in Captain America: Brave New World, so clearly this world hasn’t had decades of snikt-filled headlines.
Jean Grey’s Journey — And X-Men’s Start
After her scenes in ‘Brand New Day’, Sadie Sink’s Jean Grey was last spotted on a bus, destination unclear, though the safe money says she’s heading for upstate New York. Whether she’s about to walk into Professor X’s school or, say, Emma Frost’s rival academy, Marvel’s giving itself plenty of leeway. And with hints that Damage Control’s not-so-nice director Bill Metzger is still on the lam, plus the ominous debut of the mutant-inhibitor collar, the MCU world is about to get a lot rougher for mutants. Odds are, the first X-Men movie will be a genuine origin story — Professor X tracking down young mutants, offering sanctuary, the works.
- Sadie Sink as Jean Grey — confirmed, introduced in Spider-Man: Brand New Day
- Samara Weaving as Emma Frost — casting announced the same day
- Kit Connor as Cyclops — revealed shortly before
Given Jean’s placing and these other early picks, don’t be surprised if she ends up front and centre — the audience’s eyes into this fresh mutant world, much like Rogue in the 2000 X-Men film or Jubilee in the old animated run.
Eyes on D23 — Full Reveal Incoming?
For all of Marvel’s bombast at San Diego Comic-Con 2026 — including Ryan Gosling on a motorbike as Ghost Rider, David Jonsson inheriting the Black Panther mantle, and new film dates (Black Panther III drops December 2028, Ghost Rider rides out July 2026) — the studio stopped short of saying the X-word out loud. Marvel’s pencilled in a 5 May 2028 slot, widely suspected for X-Men, which would land the film as the first post-Secret Wars MCU outing and, cheekily, on the 20th anniversary of both Iron Man and the MCU itself.
Turns out, the decision to keep the X-Men quiet was deliberate, meant to protect the Jean Grey reveal in Brand New Day. Now, with major casting known — Sadie Sink, Weaving, Connor — expect the floodgates to open. D23 runs 14–16 August, dead in the slipstream of Spider-Man’s rollout, and all bets are on Marvel showing up with the full X-Men cast.
Every actor under the sun has apparently lobbied for an X-Men gig lately. Adam Driver’s name popped up for everything from Mister Sinister to Stryker; Cooper Hoffman was a Cyclops runner; Indie Navarrete’s reportedly been vocal about Mystique. All eyes are now on D23 for how many of these (or any other rumoured choices) will become the MCU’s next wave of mutants, with Sadie Sink’s Jean Grey firmly in the spotlight.