13. Iron Man
Iron Man is probably the best origin story a Superhero could ever have. It actually began the era of Robert Downey Jr. and made him one of the biggest stars in Hollywood. Marvel deliberately began its universe with Iron Man movie and it paid handsome dividends. He is now the most admired and recognized face of MCU.
It grossed $585 Million at a budget of just $140 Million. This gave confidence to Marvel and served as a launchpad for the ultimate comic-book universe on the big screen.