Doctor Bashir is about to turn thirty years old. While talking with Garak over lunch about his upcoming birthday, Bashir is approached by Quark who has a Lethean interested in purchasing some bio-mimetic gel. Bashir tells the Lethean that it's against Federation law to purchase any and the Lethean leaves. Later, Bashir catches the Lethean going through his infirmary. The Lethean attacks Bashir with a telepathic weapon, which sends Bashir into a coma and on a trip through his mind.
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.