Anna introduces her pilot program to invite select groups of humans to stay on each of the 29 space ships. Ryan must deal with the fact that Valerie's pregnancy is wildly accelerated. Tyler learns a secret about his mom and one of the team makes a sacrifice to save Ryan.

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".