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 do so. The first season, consisting of eight episodes, aired from February to March 2017. The second season began airing in April 2018.
Dan Stevens stars as Haller, a mutant diagnosed with schizophrenia at a young age. Also starring in the first season are Rachel Keller as Syd Barrett, Aubrey Plaza as Lenny Busker, Bill Irwin as Cary Loudermilk, Jeremie Harris as Ptonomy Wallace, Amber Midthunder as Kerry Loudermilk, Katie Aselton as Amy Haller, and Jean Smart as Melanie Bird. Aselton returned as Amy briefly in the second season, when Jemaine Clement and Hamish Linklater were promoted from guest roles to series regulars and Navid Negahban joined the cast. Lauren Tsai joined the cast in the third and final season.