The DS9 Runabout Rio Grande, with Major Kira and Dr. Bashir onboard, responds to a distress call from a Kobliad ship. The Major and Doctor are able to save one of the three passengers. The surviving Kobliad, a security officer, requests that the body of one of the dead be thoroughly examined to verify beyond a reasonable doubt that the man, Vantika, is indeed dead. Vantika had been headed to DS9 to intercept a shipment of deuridium arriving at the station from the Gamma Quadrant before he had been captured by Kobliad security.
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.