X-Men: Dark Phoenix (2019)

We come to the end of our X-Men series. In this final chapter of the Mutant saga, we follow Jean Grey who's powers become fully unlocked and uncontrollable after the X-Men save a group of Astronauts in space. This is where she is exposed to an alien force that begins turning her into the Dark Phoenix. The cast from First Class to Apocalypse make their final appearance together in a film that was released post 20th Century/Disney merger.