Three legendary Klingon warriors reunite on DS9 seeking Curzon Dax, with whom they entered into a blood oath to one day exact revenge on their sworn enemy. Finding Jadzia to be as worthy a warrior as they felt Curzon to be, they invite her to join them on their crusade.

Under increasing pressure from Starfleet Command, Sisko tries to rescue Gul Dukat, stop the Maquis from escalating conflict within the Demilitarized Zone, and prevent an all-out war between Cardassia and the Federation.