Earth has been conquered. The U.N.S. Apollo left for a 150-light-year journey to investigate an alien signal, and relativistic time dilation stretched the voyage far longer on Earth than aboard the ship. By the time the crew arrives at the source, the Cantharan Order — a religious empire — has taken the planet. The signal was a ruse from the Ishiman, a peaceful advanced race that wanted humanity to survive as a free civilization. The Ishiman supply limited technology to the crew, unable to commit to direct warfare themselves. The Apollo is renamed the Ares, and the mission becomes liberation instead of exploration.