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

The Marvels' Post-Credits Scenes, Explained

Kelsey Grammer Returns as Beast in 'The Marvels' Post-Credit Scene - Knight Edge Media

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

The rise of Marvel's post-credits scenes, explained - Vox

Leaked post-credit scenes from The Marvels confirm huge fan rumor (spoilers)

45+ Marvel Post-Credit Scenes, RANKED

Did 'The Marvels' Post-Credits Scene Leak?

How many end credits are there in The Marvels? Explained

The Marvels' Post Credits Scene: Who is ACTUALLY In It?

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