File:KlingonCardassianAlliance.gifEmblem of the Klingon-Cardassian Alliance In the mirror universe, the Klingons were a humanoid species native to the planet Qo'noS in the Beta Quadrant. They forged and ruled the Klingon Empire and subsequently the Klingon-Cardassian Alliance, two of the most prominent interstellar states over many centuries. Kahless was an ancient Klingon warrior whose teachings would become the basis of Klingon society after he defeated Molor. After his death, he was known as "He Who Shall Return. By 2282, the Klingons had made first contact with the Ferengi.