Captain Marvel' post-credit scene confirms 'Endgame' fan theory?

DanielRPK:Beast from the Fox X-Men, played by Kelsey Grammer, will appear in The Marvel's post credit scene, and supposedly will be the merging of the MCU with the Fox universe for Deadpool

Every Marvel post-credits scene explained – and what they mean for future MCU movies

List of Post-credits Scenes, Marvel Cinematic Universe Wiki

The Marvels' Post Credits Leak Confirms Major Marvel Superhero Team Up To Replace Original Avengers - FandomWire

THE MARVELS: How Many Post-Credits Scenes Does The Movie Have? Here's Your Spoiler-Free Answer!

What is a Post Credit Scene — The Movie Stinger Beyond Marvel

The Marvels' Post-Credit Scene Explained: Mutants and Parallel Universes

The Marvels Post Credit Scene

Did 'The Marvels' Post-Credits Scene Leak?

Captain Marvel mid credit scene explained: Here's why the Captain Marvel post credits scene is good news for Avengers Endgame