Benedict Cumberbatch isn't keeping secrets on 'Avengers: Doomsday' (because he's not going to be in the movie)
So, it appears, Cumberbatch's neurosurgeon-turned-Sorcerer Supreme will not return in the May 2026 film. Although "momentarily horrified by his candour" about that plot point, Cumberbatch proceeded to spill the beans about the ultra-secretive studio's plans for the next phase of Marvel movies.