While investigating radio silence at a nearby outpost, Elisabeth, Jim, Malcolm and Taylor discover an outbreak of a mysterious and fatal virus.
Jim and Shannon aren't sure if they can trust an orphan who seeks asylum at the colony; Mira tries to reclaim a valued possession; Taylor thinks a traitor is in his midst.
Jim and Taylor investigate a murder in the colony; Skye helps Josh figure out how to bring his girlfriend from 2149 to the past.
Lucas races to finish assembling his mystery device; Taylor and Jim confront the mole; Skye encounters a familiar face.
When the 11th Pilgrimage arrives, Lucas, Mira and the Phoenix group try to pillage the past.
