Divers stumble across a strange radiant canister while searching for sunken treasure. Upon opening the canister an alien being known as Ha'gel is released from its prison and assumes the identity of one of the crew and destroys the others. Boone is called to the crime scene and his suspicions are raised when he finds Taelon writing on the empty canister. Upon questioning, the Taelons tell Boone that Ha'gel is the last of an alien criminal caste. Afraid that Earth will learn the truth, the Companion's recruit the help of Beckett to deal with Ha'gel. Ha'gel assumes Sandoval's form, and confronts Beckett.

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.