Exploring the outer reaches of space, SG-1 happens across the infamous Lost City of the Ancients in this pilot episode of the show. A thorough exploration is undertaken by the crew, with the hope of finding clues that will indicate the origins of the Stargates. But as the investigation unfolds, some incredible discoveries are made, including a deadly new threat that uses human beings as an energy source, and could potentially wipe out the crew as they undertake their perilous journey.