The episodes focus on Caffrey and her team as they learn more about the signal, the fractal pattern, and the aliens. Often, their work requires them to impersonate different U.S. Government agencies. Compounding the situation, Caffrey, Cavennaugh and Pegg were exposed to a small part of the signal, which while not (as yet) infecting them, has nonetheless altered their brains, causing the trio to have bizarre, linked dreams, and also receive messages from the aliens with Caffrey, in particular, experiencing frightening, often violent hallucinations. Individuals experiencing these visions have been referred to as "dreamers" by the Threshold Red Team.