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.