Team finds a planet that has had almost no Wraith culling in the last ten years, or since the time a Wraith ship crash there. However, they are told that one or two survivors must still be alive, as occasionally a villager dies in a culling way. Sheppard offers his teams help to kill the last of the Wraith for them, only to discover when they it, it is a young Wraith female, and she is with the villager who has been protecting her, and acting as her father. The team becomes intrigued by this pair when the father says the deaths could not have been from his daughter, as he has invented a drug that blocks a Wraith’s need to cull on humans.