Stardate 50564.2: Worf and Garak, who travelled through the wormhole to find the source of Enabran Tain's message, are captured by the Jem'Hadar and brought to an internment camp. There, Garak is reunited with Tain before the old Obsidian Order leader dies. Meanwhile, Deep Space Nine monitors Starfleet listening beacons go down one by one. Fearing that a Dominion attack is imminent, Captain Sisko prepares to close the wormhole permanently. However, a saboteur destroys the pulse that would close the wormhole. Seconds after the pulse dies out, Dominion warships enter the Alpha Quadrant.
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.