It’s been 20 years since the world was introduced to Bryan Singer’s film, “X-Men.” And though it wasn’t the first (superhero films existed decades prior) and it wasn’t the most successful (Sam Raimi’s “Spider-Man” would break records two years later), “X-Men” holds a significant place in the history of superhero films—proving they could be serious and meaningful in a post-“Batman & Robin” world and that they could be blockbusters once again.