Marvel fans think Avengers reveal confirms Sadie Sink’s secret role in the MCU

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Now that Sadie Sink is officially joining the Marvel Cinematic Universe, fans are speculating about which character she’ll be playing.

I was so excited to read in Deadline that Sadie Sink, who I love from Stranger Things, is going to be in a West End production of Romeo & Juliet with Noah Jupe! The article also said she’s joining the next Avengers movie – they’re starting to film here in London next year, which is amazing!

Okay, so there’s no official word yet, but everyone’s buzzing about whether Sadie Sink might be in Avengers: Doomsday. It all started when Deadline hinted at it, and now we’re all trying to figure out who she could play if she does join the cast. It’s fun guessing!

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I was stoked to hear that Maya Hawke, who I know from Fear Street, was going to be in the new Spider-Man movie, Spider-Man: Brand New Day! Apparently, Tom Holland is coming back as Peter Parker/Spidey too, which is awesome.

Okay, so I’m hearing the next Avengers movie, directed by the Russo brothers, is going to bring in the X-Men and a bunch of other heroes. Because of that, a lot of people think Sadie Sink is going to play a really famous mutant – like, a major character from the X-Men. It’s just a rumor right now, but it’s getting everyone hyped!

“She must be a character of significance,” one fan theorised on Reddit.

They think Jean Grey might appear in Doomsday, and there’s also been discussion about Mayday, which would fit the story.

I saw someone mention that with Sink officially joining the Spider-Man 4 cast, she might be playing a character connected to Spider-Man. One fan threw out Firestar and Black Cat (Felicia Hardy) as possibilities, which honestly, sounds awesome!

One fan thought a revival of Spider-Man and his Amazing Friends would be great, pointing out that the character Firestar first appeared in that animated series.

“I would love a 2 hour Spider-Man and His Amazing Friends movie,” someone else said.

At present, we’re still in the dark as to who Sink could be play in the MCU.

Max Mayfield, known for her role in Stranger Things, is joining the cast of Spider-Man 4 along with Liza Colón-Zayas from The Bear and Tramell Tillman of Severance. These three actors are among the new faces appearing in the upcoming film.

Spider-Man 4 is scheduled to come out on July 31, 2026, and Avengers: Doomsday will follow in theaters on December 18, 2026.

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2025-11-18 17:19