Stargate: Atlantis - Season 5 Episode 11

The new race that stole the device, not to mention Rodney and Daniel, turns out to be an old one meaning very old and well known to the human race. With an ancient grudge to settle, they force Rodney to activate the device against the Wraith with a side effect that could kill millions throughout the galaxy. That makes the Wraith mad so they abscond with the Daedalus to retaliate. Once again we lowly humans have to take control of a messy situation to keep the master races from wreaking havoc in the galaxy.