We currently have 28 known characters for Avengers: Doomsday, the 27 chairs announced on the 27th of March, 2025, and Franklin Richards, played by a currently unknown child actor or actress. I don't think that we will get a second line of chairs, I do however think that we will get a handful more actors announced for Doomsday.

I believe that they will announce Brie Larson (Captain Marvel), Teyonah Parris (Maria Rambeau), Jeremy Renner (Clint Barton/Hawkeye), Danai Gurira (Okoye), Mark Ruffalo (Hulk), Evangeline Lilly\* (Wasp), and Sophia Di Martino (Sylvie). I also believe that this will happen at SDCC 2026, because it's five months before the big event movie, and they need some big news.

I believe that anyone else such as Famke Janssen\*\* (Jean Grey), Halle Berry\*\* (Storm), Hugh Jackman (Wolverine), Ryan Reynolds (Deadpool), will be in the movie, but as a surprise, because they really need to keep some surprises for the movie itself.

I also think the Young Avengers/Champions Actors, Iman Vellani (Ms. Marvel), Hailee Steinfeld (Kate Bishop/Hawkeye), Joe Locke (Wiccan), Ruaridh Mollica (Speed), Kathryn Newton (Stature), and possibly some others will be in Avengers: Secret Wars, but not Doomsday.

\*Enough money can make anyone come out of retirement

\*\*They might say they're not in the movie, but bringing back the Fox X-Men without Jean Grey and Storm is just wrong.
Theory about the unannounced characters for Avengers: Doomsday