Homeworld Command tries to convince an ally occupying a naquadria-rich planet to let them try to dial Destiny, but suspects they have already been infiltrated by the Alliance.
Chloe’s body is taken over by the mind of someone the crew believed was dead. Meanwhile, Dr. Volker is striken with an illness that threatens his life.
While surveying a new planet, Lt. Scott becomes infected by a plant-like creature. As he suffers hallucinations and falls in and out of consciousness, Tamara seeks a way to treat him.