The aliens keep Ryan in isolation on the mothership so Anna can experiment on his baby; Chad wants to fight with the Fifth Column; Erica seeks out a scientist who can explain Red Sky.
For the first time in 15 years, Diana and Anna face off; Erica makes a discovery when she has Tyler's blood analyzed.
Erica fights to keep Anna from finding out she's Fifth Column; Anna orders Ryan to find Malik; Lisa notices her body is changing.
After three Peace Ambassadors are murdered by the radical fraction of the Fifth Column, Erica tracks their leader; Anna visits the Vatican.
Anna uses Concordia to hide a fleet of breeding vessels; Eli Cohn tries to convince the Fifth Column to assassinate Anna during the gala.
Anna enlists Ryan to help in efforts to eliminate the Fifth Column; the Vatican orders Father Travis to have Jack leave the church; Lisa meets her grandmother.
Erica travels to Hong Kong to seek revenge against Anna; even after the Red Rain, Anna learns Tyler's phosphorus level is too low; Diana and Lisa begin to form an alliance.
Erica leads a risky attack against Anna; Anna encounters a major obstacle; Ryan tries to rescue his daughter.
The Fifth Column tries to figure out Anna's plans for the Blue Energy reactor; Diana tells Lisa that the time to fulfill her destiny is upon her.
Anna works to ensure the evolution of the Visitors by having Lisa breed with Tyler; Erica and Diana ask Lisa to help them remove Anna from power before she destroys humanity.