It's been 15 years since the X-Men first joined forces on the big screen, and a lot has happened since then. While comic book movies reign supreme at the box office today, back when "X-Men" was released, everyone in Hollywood was questioning whether or not a superhero ensemble movie could even make money. Well, it not only succeeded, it ushered in a decade+ era of mega comic book blockbusters that's still going gangbusters today (see: "Avengers: Age of Ultron"). But what's happened to the "X-Men" cast since 2000? Plenty. So catch up with the cast, many of whom are still donning the skin-tight getups they wore back in the day.