For the last 18 years or so, superhero movies have reigned supreme in theaters. It doesn't matter if you're a Marvel or DC Comics fan. There's something for everyone all year round. But it wasn't always that way. Moves based on comics used to be, by and large, bottom-of-the-barrel entertainment. And there were a lot of stinkers that saw the light of day. But there were some superhero movies, including planned sequels, that were so bad they wound up becoming canceled superhero movies we'll just never get to see. Ever. And thank goodness for that.