There's no doubt about it: superhero movies have been all the rage within the last couple of decades, and don't seem to be going anywhere anytime soon. By no means was the genre invented in the 21st century, as there were plenty of iconic superhero films to be released during the previous century. However, the genre's seemed to click with modern-day viewers more than generations in the past, with many of the highest-grossing movies of the century so far being superhero movies.