Out of an epic 25-year battle in which angels led by Gabriel (Carl Beukes) fought humans and their ally, the archangel Michael (Tom Wisdom), comes an unlikely hope for mankind in this supernatural drama based on the characters from the 2010 movie "Legion." Set in the fortified city of Vega (formerly Las Vegas), where an elaborate caste system is now in place to manage the Earth's war-depleted resources, Season 1 begins with a young soldier named Alex Lannon (Christopher Egan) learning he is "The Chosen One," a revelation that leads to all sorts of turmoil, both personal and political. On top of this heavy responsibility, reluctant hero Alex is in a romance with Claire Riesen (Roxanne McKee), daughter to the city's ruler Edward (Alan Dale). Their love seems doomed, however, since not only is she his superior in social class, but her father demands she enter into an arranged marriage with religious leader William Whele (Luke Allen-Gale), son of the powerful and ambitious David (Anthony Head), for the betterment of Vega. Little do they know, William has a hidden agenda---and a secret alliance---that is aimed at causing more harm than good.