https://www.youtube.com/watch?v=1VPohVW3ixg
Have you ever imagined every Marvel movie coming together like they did in the comics with no regard for dry studio talk, contracts, properties, and the like? Just the whole crew fighting together as one? This video makes that Marvel Cinematic Universe of our dreams possible for just about four minutes, smashing up every Marvel movie released to date — Avengers, X-Men, Spider-Man, the Hulk movies, even Howard the Duck! — to show us what a truly united universe would look like. Maybe there are some movies we’d like to forget, but putting the lackluster movies as a whole aside (*cough* Daredevil *cough*), it’s a really fun video worthy of even your pickiest head canon.
Source: YouTube