Plot Synopsis: With Red Sky unleashed on the planet, the world is on the brink of war and there is chaos all around. Ryan is being kept in isolation on the mothership since Anna wants to experiment on his hybrid baby. Seeking redemption for being used by Anna, Chad wants to fight with the Fifth Column. Erica goes on a journey to find a scientist who can give her the answers to what Red Sky is and it's there she learns the horrifying secret of what the Visitors are planning to do.
Plot Synopsis: In the dark bowels of the Mothership, Anna squares off with her mother Diana - who's been down there for the last fifteen years and has been presumed dead. Meanwhile, Erica has Tyler's blood analyzed and learns the Visitors did something sinister to her when she was pregnant with him.
Plot Synopsis: Erica learns Malik is a Visitor sleeper agent and must literally fight for her life to stop Anna from finding out she's Fifth Column. When Anna learns that Malik is missing, she orders Ryan to find her while Lisa realizes her body is beginning to change, causing her to become more and more like her mother.
Plot Synopsis: After the radical faction of the Fifth Column murders three Peace Ambassadors, Erica goes on a mission to hunt down their leader, Eli Cohn, a former Mossad agent. Meanwhile, as Jack and other priests around the globe begin to speak out against the Visitors, Anna heads to the Vatican in an effort to convince the leaders of organized religion that the Visitors truly are "of peace."
Plot Synopsis: Anna uses her newest gift to mankind, "Concordia," as a cover to hide an invading fleet of breeding vessels that will be used to ensure the perpetuation of Visitors for future generations. Meanwhile, Eli Cohn (guest star Oded Fehr) tries to convince Erica and the Fifth Column that the "Concordia" gala is the perfect time to assassinate Anna.
Plot Synopsis: Enraged at the increasing audacity of the Fifth Column attacks, Anna enlists Ryan in an attempt to wipe out the Fifth Column in one fell swoop. Meanwhile, Father Travis, following Vatican orders, asks Jack to leave the church, and Lisa meets her grandmother Diana for the first time.