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|An episode from Stargate Atlantis|
|Directed by||Brad Turner|
|Original air date||
USA: August 27, 2004|
UK: November 30, 2004
|Efforts to open trade relations with a species called the Genii turn sour when the team discovers their new "allies" have ulterior motives.|
- On Region 2 DVD/Blu-ray releases, "Underground" is switched with "Home", placing it just before "The Storm" and "The Eye", the following Genii-arc two-parter.