While Marvel Studios has been crushing superhero films in the Marvel Cinematic Universe, 20th Century Fox has been building the X-Men universe through their X-Men films. X-Men: Dark Phoenix marks the 12th film set in their series.
X-Men: The Dark Phoenix is also the last X-Men film to be produced by 20th Century Fox (there is an upcoming New Mutants film that may be a part of this universe). It’s the swan song to what started many great adventures of the X-Men.
As we begin to enter the final films of the 20th Century Fox film universe, X-Men: Dark Phoenix is a fitting end to the series. You get an out of this world movie with a well-done ending.