Vengeance

When a ship sending a Priority-1 distress signal emerges from the wormhole with a Klingon ship on its trail, Captain Sisko takes a team and heads out on the Defiant. Though there are no survivors on board, the crew finds clues that lead them to believe that the Founders are up to something in the Gamma Quadrant. Sisko decides to check it out, leaving Worf and O'Brien in charge of the station. Suddenly, the station is attacked by Klingons--and only Worf, O'Brien and Bashir can save Deep Space Nine from Klingon domination.