Cure

Plot:

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.