Trivia: The third act was completely changed after reshoots. The final battle originally took place in space, and was then relocated to a train.
Trivia: The soldiers guarding the X-Men on the train are part of the "Mutant Containment Unit", and have "MCU" patches on their arms. Director Simon Kinberg has said while the name wasn't initially intended to connect to the Marvel Cinematic Universe, he of course recognised the significance of the acronym as soon as the wording was suggested and was happy to make the patches quite prominent as a deliberate nod to the X-Men returning to their parent company.
Trivia: Jessica Chastain has said she didn't even know what her character's name was until she saw the film.
Trivia: Early on in production, the film was actually meant to be an epic two-part story. Part one would be called "Phoenix," while part two would be called "Dark Phoenix." The studio eventually pulled the plug on the second film for unknown reasons, forcing writer/director Simon Kinberg to fold the scripts together into one single film. Many elements of the story fell by the wayside when this happened since they couldn't be fit into one single film.
Trivia: This movie was originally meant to be the start of a new trilogy of "X-Men" movies that would follow the continued exploits of the younger "First Class" X-Men cast during the 90's. Characters such as Charles Xavier, Storm, Cyclops and Jean Gray/Phoenix were expected to return. However, after the merger of Disney and 20th Century Fox, future films were shelved and this movie was slightly retooled to serve as an impromptu finale for the franchise.
Trivia: The directorial debut of Simon Kinberg. Kinberg was chosen due to his history with the series - he was a co-writer on "X-Men: The Last Stand," "X-Men: Days of Future Past" and "X-Men: Apocalypse" and worked as a producer on several other entries.
Trivia: "Dark Phoenix" is set to be the final main-series entry in Fox's "X-Men" film series. (The spin-off film "The New Mutants" will be the last official entry in the saga, though it will be a stand-alone story with little connection to the main series.) Disney acquired Fox's movie rights during post-production, and after this film's release, the X-Men are planned to be rebooted as part of the Marvel Cinematic Universe.
Trivia: The first "X-Men" movie to not feature Hugh Jackman in any capacity. (Although he did not shoot any footage for the two "Deadpool" films, he appears in both films through either images, references or stock-footage).
Chosen answer: Four minutes earlier, one of the MCU soldiers walks past Kurt and says to him "My kid used to be a fan" (of the X-Men). So later on, Kurt yells to the same soldier "Your kid was right about us. We could help you!", meaning that he and the other mutants can be trusted to help them fight the D'Bari attackers.
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