 SG-1 is negotiating a treaty with the inhabitants of Pangera. The have sometime miraculous to offer - a drug they call tretonin that can cure any ill. But there is a catch: the drug replaces the the user s immune system and must be taken forever. The Pangerans want specific world coordinates in exchange for the drug - and some of those places are the homes of powerful system lords. They won t explain why, but it clearly has to do with tretonin. Then the Tok ra, called in to help solve the problem, make a startling discovery about the ultimate source of tretonin.