Star Trek: Deep Space Nine, season 7, episode 6
Treachery, Faith, and the Great River
Summary
A Vorta defector, Weyoun-6, gives Odo valuable information in exchange for asylum. Weyoun-7, the next clone in the series, pursues them. Nog engages in a series of barters to get a Graviton Stabilizer for Miles.
Summary from Wikipedia, CC BY-SA 4.0.
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