In 2019, Disney completed the acquisition of 20th Century Fox's film and television assets - including the Marvel properties X-Men, Deadpool, and Fantastic Four. Therefore, the latest installment of Fox's X-Men films, Dark Phoenix, became the final one in the franchise.

By the time it was released in June of that year, the Marvel Cinematic Universe had already given us Captain Marvel and Avengers: Endgame, with Spider-Man: Far from Home ready to go, and Dark Phoenix came and went from theaters with very little fanfare.