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When SG-1 discovers what they believe to be the remnants of the Lost City of the Ancients — the originators of the Stargates — Stargate Command launches an investigation. A new team of explorers, headed by civilian Dr. Elizabeth Weir, travels to the distant Pegasus Galaxy, where they discover an advanced but deserted city on the ocean floor, a group of nomadic humans, and a deadly enemy that feeds on humans as an energy source!