Alex is called upon by Michael to help prevent any further casualties after innocent higher angels turn up dead in Vega. At the same time, Gabriel causes tension by revealing a long-hidden secret, William "re-educates" his father and Noma reignites an old flame.
Based on characters from the 2010 film Legion, Dominion is an epic supernatural drama set in the year 25 A.E. when an army of lower angels, assembled by the archangel Gabriel, has waged a war of possession against mankind.
The archangel Michael, turning against his own kind, has chosen to side with humanity against Gabriel. Rising out of the ashes of the 25-year long battle are newly fortified cities which protect human survivors.