Sadie Sink is reportedly preparing for one of the biggest roles of her career yet. The 23-year-old actor, best known for playing Max in Stranger Things, is said to be joining the Marvel Cinematic Universe in the upcoming film Avengers: Doomsday. The movie is expected to release at the end of next year, and filming may begin soon in London, according to recent reports. A report shared by Deadline has almost confirmed her casting. Producer James Bierman shared new details, saying, "Spider-Man: Brand New Day is scheduled to open on July 31.