The Marvels changes everything with its post-credit scene, setting up a future crossover between the Marvel Cinematic Universe and Fox's X-Men universe. The film follows Captain Marvel (Brie Larson), Monica Rambeau (Teyonah Parris), and Ms. Marvel (Iman Vellani) as they are forced against their will to join forces and become the superhero team known as the Marvels. With the help of Nick Fury (Samuel L. Jackson) and the agents of SABRE, they battle the villainous Dar-Benn (Zawe Ashton), a Kree zealot seeking revenge for what Carol Danvers did to her homeworld of Hala.
Source：https://www.cbr.com/the-marvels-post-confirms-x-men-secret-wars-theory/
