Marvel fans are eagerly waiting for the next offering and buzzing with new excitement. This time, it’s about a wild new rumor: ‘Spider-Man: Brand New Day’, the next big Phase 6 movie, could be bringing Jean Grey into the Marvel Cinematic Universe, also known as MCU, for the very first time. The word on the street is that a very well-known face of a superhit series might be playing the legendary telekinetic mutant.

‘Spider-Man: Brand New Day’: What we know so far

‘Spider-Man: Brand New Day’ is the official title for the fourth Tom Holland Spider-Man movie. It lands in theaters July 31, 2026, and it’s part of Phase 6. Destin Daniel Cretton is directing, and the script comes from Chris McKenna and Erik Sommers, the same creatives behind the last few Spider-Verse movies. The story picks up after ‘Spider-Man: No Way Home’ and is supposed to kick off a new chapter for Peter Parker, while also weaving in bigger MCU stuff. The production of the film wrapped up in late 2025. However, Marvel is being super secretive about the plot. What everyone expects is a mix of big action, new faces, and maybe some big setups for ‘Avengers: Doomsday’ and the long-awaited X-Men crossover.

The Jean Grey rumor: What is it?

Now, about the rumor of Jean Grey, here’s the scoop: Sadie Sink (Max from ‘Stranger Things’) is officially in the cast. However, we’ve yet to know who she’s playing. Now, per Teen Vogue, a bunch of insiders are convinced she’s Jean Grey.As for the clues? Some hints about her character’s powers, color schemes straight out of classic Jean Grey comics (think yellow and green), and a few social media “leaks” that basically said, “Sadie Sink is Jean.”Not surprisingly, this set off a frenzy among MCU and X-Men fans. However, notably, Marvel hasn’t said a word about Jean Grey or confirmed who Sink is playing. To date, it’s all just rumors, leaks, and fans connecting dots. Per Teen Vogue, some reports don’t even use Jean’s name, but they keep linking Sink’s character to powers and storylines that sound a lot like hers.

Why is Jean Grey a big deal for the MCU?

For the unversed, Jean Grey isn’t just any mutant; she’s one of the OG X-Men, first introduced way back in 1963. She’s got insane telepathic and telekinetic powers and plays a huge role in epic Marvel stories, especially the Phoenix saga. Imagine Max from ‘Stranger Things’ having Eleven-like powers — now, that’s exciting, isn’t it?In past movies, Famke Janssen and Sophie Turner both played Jean Grey, but she’s never been part of the official MCU. And MCU fans have been waiting years for mutants to show up for real, so if Jean Grey appears in ‘Spider-Man: Brand New Day’, it’s a major moment. It could be the first real step toward bringing the X-Men into the mix with ‘Spider-Man’ and the ‘Avengers’.

What’s next?

What we know for sure is that ‘Spider-Man: Brand New Day’ is definitely happening, and Tom Holland is back as the friendly neighborhood Spider-Man, and Sadie Sink is joining the cast. The release date of the movie is set; it’s slated for July 31, 2026. However, right now, nobody outside of Marvel knows for sure if Jean Grey is actually in the movie, or if Sink is playing her. It’s all whispers and speculation, no official announcement yet.