Marvel fans are convinced that Brie Larson is returning to the MCU as Captain Marvel in Avengers: Doomsday after a recent social media post. The actress last appeared in 2023’s The Marvels, where she teamed up with fellow MCU superheroes Ms. Marvel (Iman Vellani) and Monica Rambeau (Teyonah Parris).

Although The Marvels post-credits scene seemed to set up Avengers: Doomsday by showing Monica in an alternate universe where her mother, Maria Rambeau (Lashana Lynch), had become Captain Marvel and worked with the X-Men — including Kelsey Grammer’s Beast — the characters’ futures in the franchise remain unknown. That includes Larson’s Captain Marvel.

When Marvel unveiled the official cast of Avengers: Doomsday, Larson was nowhere to be seen. In fact, the only actor to appear in The Marvels that was confirmed for Avengers: Doomsday was Grammer. He joined MCU mainstays like Chris Hemsworth and Anthony Mackie alongside a handful of original X-Men movie actors, including Patrick Stewart and Ian McKellen.

So the question has become why Beast would appear in Avengers: Doomsday but not Monica Rambeau or Captain Marvel. Well, after a recent post from Larson, MCU fans are convinced Marvel Studios is keeping some members of the Avengers: Doomsday cast under wraps.

Why Marvel Fans Think Brie Larson Is In Avengers: Doomsday

captain marvel looking tough
captain marvel looking tough

Earlier this week, Larson shared a photo of her voting on Election Day, Nov. 4, with a caption that reads, “Ignore the wig!! 🤫” With the hood of Larson’s sweatshirt pulled up, only a lock of blonde hair is visible, but it’s notably longer than the short pixie cut she’s been rocking for the last couple of months.

Since the glimpse of the wig looks like a longer hairstyle, Marvel fans are convinced Larson was wearing it to play Captain Marvel. Last Carol Danvers appeared in the MCU, she did sport longer hair. Additionally, Larson’s caption, with the shushing emoji, does make it seem like a spoiler of some kind, and Marvel is notoriously secretive, causing fans to believe it’s an Avengers: Doomsday spoiler.

Will Brie Larson Really Be In Avengers: Doomsday?

Captain Marvel glowing and looking serious in The Marvels
Captain Marvel glowing and looking serious in The Marvels

However, there’s one major problem with the assumption that Larson has accidentally spoiled a potential return in Avengers: Doomsday. It’s very unlikely she’s currently filming on Avengers: Doomsday since the film wrapped a few months ago, and it’s too soon for reshoots to have begun. While there undoubtedly will be reshoots, the filmmakers and studio need to first sift through the footage from the main production before they can figure out what they still need.

Additionally, reshoots aren’t likely to be done in Los Angeles, California, which is where Larson lives and would be voting. Most Marvel productions are filmed in London, UK, or Atlanta, Georgia, with a few exceptions. But it seems unlikely Larson would be filming Doomsday reshoots the same day she was voting in LA.

All that said, it’s not impossible for Captain Marvel to appear in Avengers: Doomsday. Since Beast and other members of the X-Men are confirmed to return, it would certainly make sense for Monica Rambeau and Captain Marvel to be in the movie as well. Unless Marvel has decided to retcon The Marvels and leave it behind them.

For now, it remains to be seen whether Larson’s Captain Marvel will be in Avengers: Doomsday. When the cast was first announced, Marvel indicated more actors would be revealed at a later date, but they’ve yet to do so. It’s possible Larson will be confirmed later for Avengers: Doomsday and has either already completed her filming or will be part of reshoots.

While fans might be convinced of her return, it’s best to wait for Marvel to confirm whether Captain Marvel really will be in Avengers: Doomsday when it debuts next year.

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Release Date

December 18, 2026

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