The Marvel Cinematic Universe (MCU) is an American movie franchise. It has made over 23 movies by 2019. It is a fictional universe that is the setting of several superhero movies and TV shows made by Marvel Studios, based on characters by Marvel Comics. This shared universe was showed in the movies by using the same characters or mentioning the same events. For example, Tony Stark appears at the end of The Incredible Hulk, even though he has nothing to do with the rest of the story. This is the same way that the Marvel comic books were linked into the same universe.