A long-running, 20-year series of adaptations of Marvel Comics' X-Men franchise, created by 20th Century Fox. It, alongside the Blade Trilogy and the Spider-Man Trilogy, is credited for reviving the superhero genre in the early 2000s.
It holds to the original premise of the discovery of mutants, humans who possess unusual abilities and superpowers through genetic mutations and are feared by the rest of the world. The heroes are the X-Men, a team organized by powerful telepath Charles Xavier who hopes to establish peace between mutants and regular people, with a school dedicated to helping mutants, understanding and harnessing their powers for good. Various factions oppose them, some normal human militants hoping to kill them and, most prominently, Xavier's former friend Erik Lehnsherr a.k.a. Magneto, who leads a counter-team who are trying to establish complete mutant supremacy.
Despite its source material being rooted in the Marvel Universe, this franchise was not created by Marvel Entertainment itself, preceding Marvel Studios' Marvel Cinematic Universe by almost a decade. The franchise came about when Marvel Entertainment sold the film rights to some of its most popular properties during its potential bankruptcy in the 1990s. With Fox holding the X-Men film rights, they had the exclusive rights to use X-Men (and X-Men adjacent) characters in their films, until Fox was bought by Disney.note
- X-Men (2000) - New recruits Wolverine and Rogue join Professor X's mutant team to stop Magneto and his Brotherhood of Mutants from using a devastating weapon that can mutate normal humans with disastrous side effects.
- X2: X-Men United (2003) - The X-Men reluctantly team up with Magneto and Mystique to rescue Professor X and his students from Wolverine's old enemy Colonel William Stryker, who is fully intent on mutant genocide.
- X-Men: The Last Stand (2006) - An antibody for the mutant gene has been developed, prompting the X-Men to defend those who produce it from Magneto's growing army. Meanwhile, a former ally has returned with incredible—though uncontrollable—powers.
- X-Men: First Class (2011) - A prequel depicting a young Xavier, Magneto, Mystique and Beast forming the X-Men in 1962 during the Cuban Missile Crisis to stop Sebastian Shaw and his Hellfire Club from instigating World War III.
- X-Men: Days of Future Past (2014) - A combination sequel/prequel featuring the cast members of both eras, with Kitty Pryde sending Wolverine's consciousness back in time from a disastrous, Sentinel-dominated future to unite the young Xavier and Magneto in 1973 and prevent it from ever happening. Very loosely based off the "Days of Future Past" story arc.
- X-Men: Apocalypse (2016) - A follow-up to the "past" portion of Days of Future Past. In 1983, the team face an ancient, very powerful mutant named Apocalypse and his four horsemen who wish to bring about his namesake, while Xavier and Mystique recruit a new generation of X-Men.
- Dark Phoenix (2019) - A follow-up to Apocalypse and a new adaptation of The Dark Phoenix Saga set in 1992.
- X-Men Origins: Wolverine (2009) - A prequel spin-off detailing Wolverine's Mysterious Past as an operative for William Stryker's Team X, who went rogue.
- The Wolverine (2013) - A solo Wolverine spin-off set after X-Men: The Last Stand, following Logan's adventures in Japan and based upon Chris Claremont and Frank Miller's acclaimed Wolverine miniseries.
- Logan (2017) - In an Alternate Timeline, Wolverine must protect a young mutant just like him in a future where the mutant population has dwindled dramatically. The film is Hugh Jackman's last performance as Wolverine as well as Patrick Stewart's last performance as Charles Xavier. The film draws some inspiration from Old Man Logan.
Following Deadpool's In Name Only introduction in Origins, the character got his own series of movies, which are much more faithful to his comic book self, with Ryan Reynolds portraying the "Merc with a Mouth".
- Deadpool (2016) - After learning that he has cancer, Wade Wilson undergoes an experimental treatment that turns him into a hideously-scarred mutant. Wilson then goes on a Roaring Rampage of Revenge to find the man responsible, in order to fix his condition and reunite with the woman he loves.
- Deadpool: No Good Deed (2017) - A short film in which Deadpool sees an opportunity to save the day... but it doesn't go entirely as planned.
- Deadpool 2 (2018) - Deadpool's psychotic misadventures continue as he has to protect a mutant kid from Cable, and brings Domino and the X-Force into the mix.
The New Mutants:
The final film to be made in the series before the Disney buyout, a Superhero Horror spin-off that's unconnected to the established characters. The movie became notorious for having multiple Release Date Changes over two years. While it was originally planned to be a trilogy, only one movie was made, mainly due to the aforementioned delays and the subsequent Disney buyout of Fox, which preceded the decision to do a Continuity Reboot of almost everything X-Men-related to fit within the MCU.
- The New Mutants (2020) - Five young mutants are detained in Milbury Hospital, a psychiatric facility where strange paranormal things happen.
- Legion (2017-2019) — Based on the eponymous mutant, the show follows a mentally-unstable individual prone to schizophrenic episodes. However, after an encounter with another patient, he discovers that he has latent abilities that would explain his mysterious condition.
- The Gifted (2017-2019) — The story follows a pair of ordinary parents who, after discovering their children are mutants, join an underground network of mutants to hide from the government. Bryan Singer served as executive producer, as well as director of the pilot episode.
- Gambit - Based on the character of the same name, once set to star Channing Tatum in the titular role. Notoriously experienced a long period of Development Hell, shifting from heist movie to romantic comedy, and hiring (and losing) three different directors — Rupert Wyatt, Doug Liman, and Gore Verbinski were all attached to the film before dropping out.
- Kitty Pryde - A spin-off featuring Kitty Pryde was announced on January 9, 2018 as in development by Deadpool director Tim Miller and writer Brian Michael Bendis.
- Multiple Man - Development on a spin-off featuring character of the same name was first reported on November 16, 2017, with James Franco attached to star as Jamie Madrox. The script was being written by Allan Heinberg (Wonder Woman (2017)), and was meant to be a character-driven story, to be produced by Franco's Ramona Films.
- X-23 - A spinoff/sequel to Logan featuring Dafne Keen as X-23. Logan director James Mangold announced on October 24, 2017 that a script was in progress in collaboration with X-23 co-creator Craig Kyle.
- X-Force - Based on the X-Men's black ops squad, directed by Drew Goddard, and starring Cable, Domino, and Deadpool. The project might still see the light of day as a Deadpool spin-off made with the Disney acquisition.
After the merger was completed on March 20, 2019 it was announced that this series of films would end with Dark Phoenix and The New Mutants. It was subsequently stated that the Deadpool franchise will continue in some fashion, with an R-rating note with Ryan Reynolds still portraying the character, though there appeared to have been major hiccups, specially considering Disney's "PG-13 at best" policy regarding live-action films. Disney later announced plans to incorporate the X-Men and Fantastic Four into the Marvel Cinematic Universe. However, Kevin Feige noted that plans to do so likely won't kick into high-gear until about 2024, due to Marvel's commitment to an existing five-year plan — although he later went back on this to some degree when announcing the setting's future after Phase 4, indicating that there were plans in place for mutant characters from 2022 onward, which are now certain to be delayed due to the troubles caused by the COVID-19 Pandemic on the whole entertainment industry.
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All tropes applying to specific characters can be found on the character pages.