Who Is Stranger Things’ Sadie Sink Playing In Spider-Man 4?

Tom Holland’s fourth Spider-Man film is gearing up for production, and you know what that means: casting announcements! The latest one is a doozy, too, at least if you’re a fan of a particular nostalgia-based Netflix series.

Deadline is reporting that Sadie Sink—best known for Stranger Things, The Whale, and two Fear Street films—is joining the ol’ webhead for Sony and Marvel’s fourth Spider-Man film featuring Tom Holland in the titular role. Not much information is currently available about the highly-anticipated picture outside of Holland’s return, Sink’s addition, its July 2026 release date, and that Shang-Chi and the Legend of the Ten Rings‘ Destin Daniel Cretton will be directing. Sink’s role hasn’t even been disclosed to the public yet, which begs the question… who is she playing? As per usual, the rumor mill is firing and one fiery mutant seems to be the betting favorite at the moment.

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Option A: Jean Grey

The Frontrunner By All Accounts

There have been rumors about Sink joining the Marvel Cinematic Universe as Jean Grey for weeks now. That casting makes sense, if Marvel intends on kickstarting the X-Men all over again from the very beginning. Jean Grey was one of the original members of the X-Men who were introduced way back in 1963. Sink is older than Sophie Turner was when she first played Jean Grey in 2016’s X-Men: Apocalypse but younger than Famke Janssen was when she played the red-headed mutant in 2000’s X-Men. That could mean absolutely nothing, but it is interesting to note, nonetheless. If Sink is actually playing Marvel Girl (or the Phoenix, if you’re nasty), then using her to introduce a new age of mutants in the MCU would be an interesting choice for a Spider-Man film.

Option B: Mary Jane Watson

The Obvious One, Duh

Everyone sees this particular casting choice coming from a mile away. Sink is one of the most prominent young red-headed actors working in Hollywood today. What red-haired woman is famously a major part of Peter Parker’s life (unless the editorial team at Marvel Comics have anything to say about it)? That’s right, Mary Jane Watson herself. Peter Parker and Mary Jane Watson go together like peanut butter and jelly. There’s just one tiny little problem: Tom Holland’s Spidey already has an MJ in Zendaya’s Michelle Jones-Watson. Could the MCU get cute and introduce a new MJ now that everyone has forgotten that Peter Parker even existed? Crazier things have happened.

Option C: Firestar

The Left-Field Option

Another red-headed mutant! Funnily enough, having Firestar join the MCU in a Spider-Man movie would make a crazy amount of sense. Although Angelica Jones has been an X-Man, an Avenger, a Hellion, a New Warrior and a West Coast Avenger at various times over the years, she didn’t debut in the comic books. No, Jones got her start as a supporting character created for NBC’s early-’80s cartoon Spider-Man and His Amazing Friends. Yes, the show that featured Spider-Man teaming up with Iceman and the new character of Firestar, because they couldn’t get the rights to the Fantastic Four’s Human Torch at the time. Nostalgia is a powerful drug and seeing Firestar join Spidey on the big screen would feel more than a bit poetic.

Option D: Black Cat

The Yin To Spidey’s Yang

If Sony had gotten their way with the hilariously-titled “Sony’s Spider-Man Universe” of films, Black Cat would’ve already made her movie debut years ago in the unproduced Silver & Black. As it stands, seemingly nobody wants to see a whole bunch of Spidey-based movies without, you know, Spider-Man in them. Could Sadie Sink play Felicia Hardy? Of course, she could. The good boy-bad girl routine has worked out for Batman and Catwoman on the big screen numerous times over the years. This option isn’t as likely as the more heavily-rumored ones, but it isn’t impossible either… even if one particular Black Cat casting has been somewhat shut down by series producer Amy Pascal.

Option E: Silver Sable

The “Um, Probably Not”

Ah, the other half of the doomed-from-the-start Silver & Black. Silvija Sablinova—yes, that is her real name, thank you very much—has been around in Marvel Comics since 1985 and has made plenty of appearances outside the funny pages over the decades. For example, she’s been in pretty much every Spider-Man cartoon since the mid-’90s and had a somewhat-starring role in Insomniac Games’ 2018 Spider-Man video game. She’s a mercenary with a code of honor who usually leads a group of like-minded individuals known as the Wild Pack. If Kevin Feige and company were going to bring one of Black Cat and Silver Sable to the MCU, the safer bet would be of the feline variety.

Option F: Gwen Stacy

The Least-Likely Choice

This one seems like it is simply not going to happen. Just about the only thing that genuinely worked throughout both of The Amazing Spider-Man films were Andrew Garfield and Emma Stone’s onscreen chemistry as Peter Parker and Gwen Stacy. How much of that was due to their offscreen romance at the time is up to you to decide. But whenever those two got to play off of each other on camera, it was dynamite. Fans even got (an admittedly milquetoast) adaptation of the infamous “Night When Gwen Stacy Died” storyline in 2014’s The Amazing Spider-Man 2. Multiversal counterparts to the mainline Gwen Stacy are major players in both Sony’s Spider-Verse films and the Disney Channel’s Spidey & His Amazing Friends preschool animated series. Crazier things have happened in the MCU—both the Eternals and Inhumans got projects centered around them, after all—but this feels like a real long shot.

So who is Sadie Sink playing in the next Spider-Man movie? Your guess is as good as anyone’s. Maybe she’s playing a reincarnated version of Natasha Romanoff! She could be the long-lost daughter of Steve Rogers! Hey, has anyone heard from Kang the Conqueror in a while…?