Marvel is adding Oscar-nominated actress Sandra Hüller to the cast for a cameo in “Avengers: Doomsday,” with details of her role described as top secret. The film is already in post-production under directors Anthony and Joe Russo, and is scheduled for release on Dec. 18.

Both outlets frame the news as part of a larger high-profile casting push for a major Marvel release. Variety emphasizes that Hüller’s involvement joins an ensemble of award-winning and major movie stars and situates the casting announcement alongside the directors’ post-production stage. The Hollywood Reporter also highlights Hüller’s wider momentum this year, pointing to her success with “Project Hail Mary,” while reporting her planned cameo in the Russo-directed film.