As a comet heads towards Earth, an unlikely group of survivors takes refuge in a bunker underneath the English town of Slough; Jamie makes a discovery about his wife; Sister Celine leaves the convent; Rhonda struggles to survive in prison.

The impending comet creates riots; Scotty presents a plan to save the world; loyalties are tested; Sister Celine and Father Jude look into the second coming.

The announcement of Operation Savior helps subdue worldwide chaos; Celine learns more about Father Jude's skepticism; Rhonda is taken hostage; Scotty is faced with a choice.

Jamie and Dave go to a psychiatric hospital in search of information regarding Ariel's whereabouts; the Vatican asks Father Christophe to help Celine and Jude look for a messiah; Ariel holds Spike hostage.

Jamie is faced with an upsetting truth about his wife; a potential messiah unearths Celine and Jude's genuine emotions; Scotty and Gaines realize they are under Ariel's surveillance.

Jude tells Jamie about his family history; Scotty must commit a crime to save Rhonda from the police; Ariel talks Sutton into kidnapping Jamie's daughter.