However, the next two X-Men films, X-Men Origins: Wolverine (2009) and X-Men: First Class (2011) were instead prequels that took place before the events of the first X-Men movie.
Namun, dua film X-Men berikutnya, X-Men Origins: Wolverine (2009) dan X-Men: First Class (2011) bukan prequel yang terjadi sebelum peristiwa film X-Men pertama.