Premise: "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, began airing on February 8, 2017. A second season was ordered in March 2017.
Hypothesis: Legion was part of the X-men series.