The excitement around Marvel’s upcoming film Spider-Man: Brand New Day continues to rise, and one of the biggest talking points is the casting of Sadie Sink. Known globally for her breakout performance as Max Mayfield in Stranger Things, Sink has officially joined the Marvel Cinematic Universe (MCU). Her presence on the Spider-Man: Brand New Day set has sparked a storm of speculation online. Fans are eagerly following every update about the Sadie Sink Brand New Day shoot, trying to decode who she might be playing and how her character will shape the storyline.
Filming Kicks Off in Glasgow and London
Production for Spider-Man: Brand New Day started earlier this year, with major sequences filmed in Glasgow, Scotland, before moving to London. The streets of Glasgow have often doubled as New York City in Marvel projects, and this shoot was no exception. Locals spotted large Marvel set pieces, stunt doubles, and a glimpse of Tom Holland filming new Spider-Man scenes.
Amid the bustling set, the arrival of Sadie Sink drew major attention. Although Marvel Studios is keeping her role tightly under wraps, multiple outlets confirmed she has already filmed scenes in Glasgow and is scheduled for key sequences in London. Interestingly, one viral photo that fans initially believed showed Sink on set turned out to be a crew member, highlighting just how eager the fanbase is for any update about her character.
Who Is Sadie Sink Playing?
The biggest question surrounding the Sadie Sink Brand New Day shoot is: who is she playing? Marvel hasn’t revealed anything concrete, but several strong rumors and fan theories are circulating.
1. Anabelle Adams
One of the more intriguing leaks suggests Sink might portray Anabelle Adams. In the comics, Anabelle is a singer and bartender who becomes romantically linked to Scarlet Spider (Kaine Parker). While this would be a relatively obscure choice, Marvel has a history of introducing lesser-known characters and giving them more prominence on screen.
2. May “Mayday” Parker (Spider-Girl)
The theory generating the most excitement is that Sink could be playing Mayday Parker, the daughter of Peter Parker and Mary Jane Watson from an alternate universe. In Marvel Comics, Mayday grows up to become Spider-Girl, carrying forward her father’s heroic legacy.
Given the MCU’s ongoing exploration of the multiverse—especially after Spider-Man: No Way Home and Doctor Strange in the Multiverse of Madness—this rumor feels highly plausible. Introducing Mayday would allow Marvel to expand the Spider-Man franchise beyond Tom Holland while keeping the Parker legacy alive.
3. Other Fan Theories
Fans have also speculated about classic characters such as Gwen Stacy, Mary Jane Watson, or even Jean Grey (if Marvel is preparing to merge the X-Men with the MCU). Another popular theory is that Sink could be playing Teresa Parker, Peter’s long-lost sister from the comics.
At this stage, nothing is confirmed, but Marvel’s secrecy only fuels the hype.
Official Hints About Her Character
While Marvel has avoided revealing the character’s name, industry insiders have dropped small descriptions. Reports describe Sink’s role as a “sharp and free-spirited young woman with a mysterious past.” That phrasing leaves room for almost any interpretation, but it does suggest her character will be more than just a side role. The words “mysterious past” especially point to someone significant within the larger Spider-Man mythos.
Why Sadie Sink Is a Perfect Fit for the MCU
Casting Sadie Sink in Spider-Man: Brand New Day feels like a natural next step for the actress. Since joining Stranger Things in Season 2, Sink has proven her ability to bring emotional depth and intensity to her roles. Her acclaimed performance in Darren Aronofsky’s The Whale showed her versatility and range as an actress.
In the MCU, she could seamlessly embody a strong, layered character like Mayday Parker or Gwen Stacy—someone who isn’t just a background figure, but a central part of the story. Marvel has a tradition of bringing in rising young stars at just the right time, and Sink fits that mold perfectly.
The Bigger Picture: What Spider-Man: Brand New Day Means
Spider-Man: Brand New Day is expected to be one of Marvel’s biggest projects following the events of Avengers: Doomsday. The storyline reportedly explores a fresh chapter in Peter Parker’s life, balancing superhero responsibilities with new personal challenges.
If Sink’s character is indeed connected to the multiverse, her introduction could pave the way for spin-offs and new arcs within Marvel’s Spider-Man universe. The studio is known for planting seeds early that pay off in future films and series, so her role could have long-term significance.
Release Date and What Fans Can Expect
Spider-Man: Brand New Day is scheduled to hit theaters on July 31, 2026. Between now and then, fans can expect more set photos, teasers, and eventually, a trailer that might finally confirm who Sink is playing.
Until then, the Sadie Sink Brand New Day shoot will remain one of the most talked-about topics in the MCU fandom. Whether she’s playing Mayday Parker, Anabelle Adams, or another surprise character entirely, one thing is clear: Sadie Sink’s addition to the Marvel roster is already one of the most exciting moves of Phase 6.
Final Thoughts
The MCU thrives on speculation, and the Sadie Sink Brand New Day shoot is the perfect example of that. With fans dissecting every clue, theory, and rumor, her casting has already generated massive buzz before Marvel has even confirmed her role. Regardless of who she plays, Sink’s undeniable talent ensures that her presence will leave a lasting impact on the Spider-Man franchise.
As filming continues in London, audiences worldwide will be keeping a close eye on the updates. Marvel’s secrecy guarantees surprises, but one thing is certain—Sadie Sink’s journey in the MCU has just begun, and fans are here for it.
