The Marvel Cinematic Universe (MCU) is a media franchise and shared universe centered on a series of superhero films produced by Marvel Studios. The films have, of course, been filled with superstars for years. Going back more than a decade, these movies have boasted casts that no other production company seems to get close to. On top of that, there are so many celebrity cameos and short appearances that they're hard to keep track of (and, sometimes, even difficult to spot in the first place).
To discover the celebrities you didn’t realize participated in Marvel films, click through this gallery.