Garak, the Cardassian clothier on Deep Space Nine, begins to suffer from seizure-like conditions. Doctor Bashir tries to offer his services, but each time Garak refuses. Witnessing Garak attempting to purchase some merchandise from Quark sparks Bashir's curiosity and, with Odo's help, he is able to find out that Garak has an implant which is malfunctioning and could end up killing him.
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.