Claim: Dan Stevens stars in Legion.

Legion is an American cable television series created for FX by Noah Hawley , based on the Marvel Comics character David Haller / Legion . It is connected to the X-Men film series , the first television series to be so , and is produced by FX Productions in association with Marvel Television . Hawley serves as showrunner on the series .   Dan Stevens stars as Haller , a mutant diagnosed with schizophrenia at a young age . Rachel Keller , Aubrey Plaza , Bill Irwin , Jeremie Harris , Amber Midthunder , Katie Aselton , and Jean Smart also star . FX and Marvel Television announced a new collaboration to create a television series based on the X-Men character Legion in October 2015 , with Hawley signed on to write , and direct the pilot . Casting began by January 2016 , and filming took place in Vancouver . Hawley wanted to show Haller as an `` unreliable narrator '' , including mixing 1960s design with modern-day elements , and filming the series through the title character 's distorted view of reality .   The eight-episode first season of Legion premiered at the Pacific Design Center on January 26 , 2017 , ahead of its FX debut on February 8 . The series received critical acclaim , particularly for its visuals and departure from superhero genre standards . A second season , of ten episodes , was ordered in March 2017 and is planned for a February 2018 release .