Sadie Sink’s SPIDER-MAN: BRAND NEW DAY Role Reportedly Revealed, and it Links to Tobey Maguire’s Spider-Man

Marvel fans have been tossing around theories over who Sadie Sink might play in Spider-Man: Brand New Day. From Jean Grey rumors to whispers of original characters, it’s been a guessing game, but now, things are getting interesting.

According to The Hot Mic podcast, co-host John Rocha claims that Sink is swinging into the MCU with a legacy.

Rocha says that the Stranger Things star is playing Mayday Parker, the daughter of Tobey Maguire’s Peter Parker and Mary Jane Watson. That would be really interesting and cool if true. It not only digs into the Spider-Man mythos, it’s also builds on the foundation laid by Spider-Man: No Way Home’s multiverse chaos.

In the comics, May “Mayday” Parker hails from an alternate future where Peter and MJ’s child, originally believed to have died, was secretly saved and raised.

As a teen, she inherits her father’s powers and eventually suits up in Ben Reilly’s Spider-Man costume to take on threats like Normie Osborn, grandson of the original Green Goblin. Chances are the creative team behind Brand New Day will change things up with her story if they do introduce her in the movie. But, there are a lot of storytelling possibilities.

Jeff Sneider also chimed in, backing the Mayday Parker report and adding some additional info. According to Sneider, Sink’s Mayday will befriend Tom Holland’s Peter Parker in Brand New Day, potentially filling the emotional space left behind by MJ and Ned.

He also said film’s villain will be Mister Negative, a relatively newer but visually striking bad guy introduced during the Brand New Day comic run in the late 2000s.

A secondary female villain may also appear, reportedly played by Succession star Sarah Snook. Oh, and there’s still talk that Steven Yeun could portray Mister Negative himself, a.k.a. Martin Li.

It will be interesting to see if any of this turns out to be true. Regardless, Spider-Man: Brand New Day is shaping up to be a true multiversal playground. Positioned between Avengers: Doomsday and Avengers: Secret Wars, the film might serve as a bridge connecting Peter Parkers across dimensions while setting up deeper emotional stakes for Holland’s web-slinger.

Meanwhile, Sadie Sink remains playfully tight-lipped. When asked about the Jean Grey rumors (which appear unrelated now), she replied:

"This is news to me. This is news to me. No, I have nothing to say about this. The rumours are really cool, though. It's an awesome rumour. I know the character. It's a great character, so that was cool to read."

Directed by Shang-Chi’s Destin Daniel Cretton and written by Spider-Man: No Way Home scribes Chris McKenna and Erik Sommers, Spider-Man: Brand New Day swings into theaters on July 31, 2026.

So what do you think? Would you be excited to see Sadie Sink suit up as Mayday Parker?