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.

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. Elsewhere, General Riesen and David Whele try to tie up loose ends.

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

A powerful Vega senator takes the city's leaders and food supply hostage while demanding the secret identity of the Chosen One is made public; Michael is called to a family meeting of archangels.

Alex begins training with Michael, but a vision causes him to go rogue; Claire takes risks to protect Riesen; David makes moves to secure his power.

Alex seeks Michael and Claire's help to exorcise captive eight-balls of their angel possessors; David closes in on William's underground acolytes; Riesen overturns David's plans to usurp power.

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 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.