From the introduction: Seeking allies and technologies to save Earth from an alien fleet led by the false “god” Anubis, the team SG-1 follow clues to an Ancient defence outpost buried under Antarctica; clues that also point to the location of a fabled city of the Ancients – the builders of the Stargate network – that was known to humanity in legends as Atlantis. Now, with Anubis’s fleet routed, the Stargate project has gathered volunteers from across the world and assembled an expedition to the Pegasus Galaxy. With the enormous energy requirements involved and other alien threats still looming over Earth, it may be a one-way trip.