In the Season 1 finale, the revelation of a higher angel's identity puts Alex and Michael at odds and Alex goes before the Senate to plead his case. Meanwhile, the marriage of Claire and William is followed by General Riesen's departure from Vega, Arika meets a delegation from Helena who bring with them shocking cargo, and Gabriel raises some suspicions with his so-called surrender.

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.

The 8-Ball Army breaches the walls of Vega at the same time, David makes one final sacrifice to secure his survival. Meanwhile, Gabriel forces Michael back to Mallory; Noma’s dark secret is revealed; Claire is desperate for closure; and Alex fights for control of the only home he has left.

20 years after angels descended from heaven to lay waste to the human souls they felt God had favored over them, a reluctant "savior" must arise to protect Vega, the last remaining stronghold of humanity. The savior has more to fear than just angels, as the elites of this new society conspire to gain power for themselves.

With Vega smoldering, Michael squares off with Gabriel; Noma’s past is explored; Arika contemplates her escape; William makes a decision that seals Vega’s fate; Alex tries to save everyone.

Alex takes on the not-so-easy task of trying to exorcise captive eight-balls of their angel possessors, and enlists Michael and Claire for help; David closes in on William's underground acolytes; at the same time, Riesen overturns David's plan to usurp power with a new alliance.

With Gabriel in pursuit, Alex and Noma search for an ally; Claire befriends her assassin.

Alex and Noma head to New Delphi after an attack; Claire begins to understand her responsibilities.

Alex rejects his new role as the Chosen One, but then a sleeper threat in Vega forces him to spring into action and protect the ones he loves. Meanwhile, Michael meets with Gabriel one last time before the war between angels and mankind reignites; and Gen. Riesen and David Whele try to tie up loose ends.

Alex attempts to escape his responsibilities as the Chosen One by leaving Vega, but an encounter with Gabriel's forces leave him and Michael fighting for their lives. Meanwhile, Riesen goes too far in the name of security.

The Darkness overtakes the citizens of Vega; William wrestles with the truth about his time in the desert; Arika becomes the victim of her own manipulations; Michael grows concerned about Noma; Alex searches for the Amphora.

Alex attempts a dangerous eviction in an effort to save Vega from an impending attack; at the same time, Michael plots their escape from New Delphi; and Claire desperately navigates the fallout of Civil War as Gates travels behind enemy lines to kill a broadcast that threatens peace in the city. Elsewhere, David procures his role in the rebellion following correspondence with an unexpected ally.