Stranger Things star Sadie Sink has reportedly joined the cast of Avengers: Secret Wars, making her Spider-Man 4 character even more mysterious

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But we still don't know who Sadie Sink is playing in Spider-Man 4

Sadie Sink as Max Mayfield in Stranger Things 4
(Image credit: Netflix)

Despite Marvel fans still being in the dark over which comic book hero Sadie Sink is playing in Spider-Man 4, it seems as though the character is important enough to appear in further MCU movies, including Avengers: Secret Wars.

As reported by Deadline, Sink has joined the cast of Avengers: Secret Wars and is due to start shooting in London later in 2026. Marvel Studios has yet to confirm the news.

The Secret Wars news has fans theorising even further. "She’s definitely playing Firestar, who is an X-Man and Avenger in the comics," said one fan on Twitter, and another replied, "So she's either Mayday Parker, Firestar, or Jean Grey." Whoever she is, the character must be crucial enough to break out of the Spider-Man world.

Megan Garside
Megan Garside
Junior Social Media Editor, GamesRadar+

I'm the Junior Social Media Editor here at GamesRadar+, handling all of Total Film's social platforms. However, I also write, covering all things film and TV for the site's entertainment section. I joined GamesRadar+ in 2023 and have been here ever since. I previously worked in communications after graduating with an MA in journalism. In my spare time, you can find me binging horror movies or getting lost in a cosy little game on my Switch.

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