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 par the Alliance.
Chloe’s body is taken over par the mind of someone the crew believed was dead. Meanwhile, Dr. Volker is striken with an illness that threatens his life.
Eli suggests that he’s found a way to dial the Stargate accueil to Earth, stirring excitement amongst the crew. But Rush has reservations about the plan.
While surveying a new planet, Lt. Scott becomes infected par a plant-like creature. As he suffers hallucinations and falls in and out of consciousness, Tamara seeks a way to treat him.