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In the episode a city is being attacked by the bad guys. The defense shield for the city doesn't work because part of it was stolen by the black ops technology thieves from earth. What is the episode?

Thanks to everyone! You helped me find this quote:

My people have depended on the sentinel for 300 years. It is created to be there always. So that we may feel free to pursue matters of the mind and spirit without fear of what is happening now.

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  • I don't see an actual question.
    – onewho
    Commented Jul 20, 2012 at 19:13
  • Thanks guys! I was looking for this quote (posted in the question) Commented Jul 20, 2012 at 19:30
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    @onewho - perhaps bad guys stole it ;-)
    – Jared
    Commented Jul 23, 2012 at 4:50

2 Answers 2

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I believe the episode you are looking for is Stargate SG-1, Season 5: Episode 20, "The Sentinel"

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There is a pattern here that appears in several other episodes of SG1; In addition to The Sentinel (the answer), Touchstone and Thor's Chariot each feature a device that is protecting the inhabitants of the planet, then someone from Earth comes along and alters/removes/destroys it, and then SG1 has to come in and save the day.

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    This is probably more appropriate as a comment than an Answer, since it doesn't address the op's Question at all, but comments on the episode's morals.
    – Mufasa
    Commented Jul 20, 2012 at 20:53
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    @Mufasa The Sentinel is the answer, the rest doesn't comment on the morals but on the plot...which I thought was interesting enough to include.
    – NominSim
    Commented Jul 21, 2012 at 3:36
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    There's also Dome City, where a dome (maintained by slaves) keeps the surface-dwellers alive. Commented Jul 22, 2012 at 2:16

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