A Klingon is put into Odo's jail for overextending his stay in one of the holosuites. He had been reenacting a famous Klingon battle fought decades before. Once Jadzia hears the Klingon's name, she lets him out of jail. The Klingon, along with his three companions, swore a blood oath with Curzon Dax eight decades ago to hug a Klingon known as The Albino, who killed all three Klingons' first-born sons. Now, The Albino has been found and the chance for vengeance is at hand.
When the Cardassian occupation of Bajor ended in 2369, the mining space station Terok Nor was left abandoned, its systems ripped out. By invitation of the Bajoran provisional government, Starfleet stepped in to oversee the rebuilding and day-to-day operations of the newly christened Deep Space Nine.
The years of Starfleet's nonintervention into Cardassian matters, however, had taken its toll on relations with the Bajorans. Consequently, Starfleet's position was a tenuous one; many Bajorans, suspicious and hostile as a result of decades of Cardassian oppression and brutality, did not greet the Federation's presence with open arms. The Federation's assistance is put to the test as DS9 becomes a center of travel and commerce that stretches into the Gamma Quadrant.