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.

The Taelons introduce interdimensional travel to human customers. A young deaf-mute boy and his mother become separated during their travels through the portal. The boy appears and is now able to speak and hear. The boy is examined by Dr. Park, a resistance doctor, who discovers that he has been implanted with a device to restore his missing senses. Boone suspects that the Taelons are using the portal to perform experiments on humans. Doors sends Sahjit through the portal with a tracking device.

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.