Legion is a cat.
Legion (Marvel Comics) . Legion stars in his own TV series of the same name where he is portrayed by Dan Stevens . 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 . A second season , of ten episodes , was ordered in March 2017 and is planned for a February 2018 release .