The Dominion War is an extended plot concept developed in several story arcs of "", an American science-fiction television series produced by Paramount Pictures. In the fictional "Star Trek" universe, the Dominion War is a conflict between the forces of the Dominion and the Cardassian Union against the Alpha Quadrant alliance of the United Federation of Planets, the Klingon Empire and, later, the Romulan Star Empire. The war takes place in the final two seasons of the series, but is gradually built up to over the course of the five preceding seasons.