In an alternate timeline where USS Enterprise-C travelled twenty years into the future instead of finishing the Battle of Narendra III, the United Federation of Planets slowly succumbed to conquest by the Klingon Empire. (TNG episode: "Yesterday's Enterprise") Without the Federation, the Alpha Quadrant was conquered by the Dominion and its allies. The Temporal Integrity Commission considered this timeline an "aberration". (STO mission: "Temporal Ambassador")