At resistance headquarters, Boone meets two molecular biologists, Sahjit Jinnah and his fiancee Rayna Armitraj, who are studying the alien probe captured after it wreaked havoc in an Amish community. A power surge causes Rayna to cut off the top of the probe, which responds by dematerializing her. Unaware of the situation, Sahjit and Boone discuss with Doors and Auger the probe's purpose, recalling its ability to replicate butterflies into killers. Launching the resistance into battle with the probe that may be studying Earth.

Ne'eg dies from being exposed to a devastating virus that was unleashed from an alien probe. The virus falls into the hands of a group of white supremacists, they release the virus into the Lincoln Hills homeless shelter. The deadly virus quickly spreads, threatening to decimate both the human and Taelon races. Boone, infected with the virus, comes up with an idea to develop anti-bodies against the virus but it may not be in time to prevent the virus spreading over earth.

Nine hours after Beckett conceived, her child is born. The Resistance must decide what to do with Beckett and her rapidly developing child, Liam Kincaid, who reaches maturity within hours of being born. Sandoval reveals Boone's ultimate fate to Lili. Rayna transmits a signal to the Jaridians, an alien race. A Jaridian probe replicant assassin is sent to destroy all Companions. At Boone's funeral the Taelon Synod leader, Quo'on, is assassinated, but Liam saves Da'an. Da'an appoints Liam as his personal protector. Zo'or realizes that if the replicant kills Da'an, then he'll be made synod leader by default.