The Joker is one of the most popular characters in comic books and indeed all of fiction, thanks to his portrayals in movies by great actors like Jack Nicholson, Heath Ledger and Jared Leto. His popularity stems from how interesting, complex and entertaining he is, but that doesn't change the fact that he's also crazy, evil and psychotic. There are characters who can outdo the Joker in those areas, however - not least in the universe of DC's biggest rivals: Marvel. In this video, we'll take a look at some examples of that. Here are ten Marvel superhero villains who would put the Joker to shame.