Dark Phoenix (also known as X-Men: Dark Phoenix) is a 2019 American superhero film based on the Marvel Comics X-Men characters, produced by 20th Century Fox and distributed by Walt Disney Studios Motion Pictures. It is the twelfth installment of the X-Men film series, and the sequel to X-Men: Apocalypse (2016). The film is written and directed by Simon Kinberg (in his feature directorial debut) and stars an ensemble cast featuring James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult, Sophie Turner, Tye Sheridan, Alexandra Shipp, and Jessica Chastain. In Dark Phoenix, the X-Men must face the full power of the Phoenix after a mission in space goes wrong.
After X-Men: Days of Future Past (2014) erased the events of X-Men: The Last Stand (2006) from the series' timeline, Kinberg expressed interest in a new adaptation of Chris Claremont and John Byrne's "The Dark Phoenix Saga" in a future film that would be more faithful than his previous attempt with The Last Stand, which was not well received. The new adaptation was confirmed as a follow-up to Apocalypse in 2016. Kinberg signed on to make his directorial debut in June 2017, when the majority of the cast was set to return from Apocalypse. Filming began later that month in Montreal and was completed in October 2017; the entire third act was later reshot in late 2018 following poor test screenings. The film was dedicated to the memory of X-Men co-creator Stan Lee, who died in 2018.
Dark Phoenix was theatrically released in the United States on June 7, 2019. With a worldwide gross of $251 million, the film was the lowest-grossing installment of the series. It received generally unfavorable reviews, with some critics describing it as "boring" for its lack of plot and character development and viewing it as a disappointing and anticlimactic conclusion to the Fox X-Men series, although the performances of the cast and Hans Zimmer's score received praise.