Sadie Sink Said to be Filming Avengers Role in London Next Year

by Shawn Kirk
November 19, 2025
Sadie Sink will reportedly reprise her top-secret upcoming Spider-Man: Brand New Day role in “the next Avengers” film as per a report by Deadline‘s Baz Bamigboye. It is not entirely clear from this if that means she will appear in Avengers: Doomsday, Avengers: Secret Wars, or both. There is no confirmation regarding this from the Stranger Things actress and Marvel Studios yet. In the report, Bamigboye mentioned, “Spider-Man: Brand New Day is scheduled to open on July 31. There has been much speculation about the role Sink has in the Spidey film, and frankly, I do not know the answer, but I do know that she’ll join the cast of the next Avengers picture that shoots here in London later in 2026.”

Based on this timeline it’s more likely this refers to Secret Wars which is set to begin shooting in the summer of 2026. Doomsday has finished filming in London, wrapping up in September. But when it comes to the MCU and the secrecy around their films, you never can tell. That includes just what role Sink will be playing in Brand New Day when it debuts next summer. Popular guesses include Mary Jane Waton, Firestar, Jean Grey, or Mayday Parker.

Avengers: Doomsday is slated for release on December 18, 2026, with Avengers: Secret Wars planned to hit theatres on December 17, 2027.
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Comments...

Last 10 comments - ( Read All Posts )
since83 - 2025-11-20 @ 8:09 pm
On 11/20/2025 at 1:49 PM, jkpopculture said:

Agreed firestar would be my preference as well. For one unlike the other mutant characters rumored firestar actually has an inherent connection to spider man and I would just like to see firestar in the MCU in general. I posted the mayday theory mostly because while I don't like it it seems like the kinda creative choice the MCU would make at this point. I'll still hold out hope for firestar though. Of the major rumors it's the one I like the most and the one that I think is the best fit.

I agree that it probably is Mayday or some version of Gwen since she's in Secret Wars. But we can hope!

jkpopculture - 2025-11-20 @ 7:49 pm
On 11/20/2025 at 10:17 AM, Lord_Scareglow said:

Honestly out of all the rumours, which I believe none at this point since there is a new one every single day.

I'd like her to be Firestar, it would make sense for 2 reasons for me, 1 she can be important enough to move on to say an avengers movie, and 2 she can be a member of new Avengers, if only for the sake shes a young character and she can start building New Warriors for the MCU.

Agreed firestar would be my preference as well. For one unlike the other mutant characters rumored firestar actually has an inherent connection to spider man and I would just like to see firestar in the MCU in general. I posted the mayday theory mostly because while I don't like it it seems like the kinda creative choice the MCU would make at this point. I'll still hold out hope for firestar though. Of the major rumors it's the one I like the most and the one that I think is the best fit.

since83 - 2025-11-20 @ 4:29 pm

Agreed, if I were casting, I'd want her as Firestar or Rachael Summers. Unfortunately, she definitely won't be Rachael, and probably won't be Firestar. I hope she is. We will see next yr, or when the trailer drops maybe. Isn't BND coming next?

Lord_Scareglow - 2025-11-20 @ 4:17 pm

Honestly out of all the rumours, which I believe none at this point since there is a new one every single day.

I'd like her to be Firestar, it would make sense for 2 reasons for me, 1 she can be important enough to move on to say an avengers movie, and 2 she can be a member of new Avengers, if only for the sake shes a young character and she can start building New Warriors for the MCU.

GnarlyCharlie85 - 2025-11-20 @ 10:41 am

I think she is gonna be the spiderman villain Screwball. The villain that Livestream's her crimes as there happening.

jkpopculture - 2025-11-20 @ 4:44 am
On 11/19/2025 at 5:02 PM, Atlantis said:

Calling it now, she will be Jocasta, they're faking the fanboys out over the red hair. Trust me its Jocasta, I'm never wrong about these things.

I'm pretty sure you are joking but T'Nia Miller was already cast as Jocasta for Vision quest. Although I wouldn't be surprised if the hair thing is still a fakeout. She could really be any major female marvel character not yet cast in the MCU. Given that most of the speculation is entirely based on her hair color just shows that we really don't know.

Atlantis - 2025-11-19 @ 11:02 pm

Calling it now, she will be Jocasta, they're faking the fanboys out over the red hair. Trust me its Jocasta, I'm never wrong about these things.

jkpopculture - 2025-11-19 @ 6:46 pm

At this point it's probably either a version of mayday (possibly/probably the daughter of Toby's spider man specifically) or she's a version of firestar. My guess is if it is mayday she'll be under a different name throughout the movie and then will be revealed at the end . I'm leaning towards mayday being the more likely choice even if I would definitely prefer firestar. Either way it's probably not going to be a version of Mary Jane and that's probably for the best. Introducing her at this point regardless of wether it is a variant or not just seems like an unecessary overcomplication and just not a good idea in general. I'm not really a fan of her being mayday for the same reason (despite being a fan of the character ) but I understand that is the likely choice at this point . That or it's going to be some kind of other curveball but it's probably not.

since83 - 2025-11-19 @ 5:34 pm

Last rumor I saw was an obscure villain. I didn't think they'd cast a known name as that, but now that's right out.

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