At the beginning of the 24th century, the Earth Federation faced a powerful enemy, the non-humanoid race of the Dromi. Their star empire is huge, and the number is ten times greater than the population of the Earth and all its colonies, they do not know the fear of death and never retreat... The Dromi fighting clan captured Thar, a distant world on the edge of the Abyss, once colonized by people. The attempt to recapture the planet ended in failure. Lieutenant Mark Valdez, the only survivor of the entire Earth squadron, ends up on Thar, his homeland, which he left many years ago. He found himself here at a fatal moment for this world, when his loved ones, fellow countrymen, everything that he remembered and loved, was threatened with destruction...