Grand Nagus Zek returns to Deep Space Nine, and he wants Quark to be in charge of the negotiation with a race from the Gamma Quadrant that will secure the Ferengi presence in a new corner of the galaxy. A very knowledgeable Ferengi named Pel, who has impressed Quark with his ability to recite the Ferengi Rules of Acquisition from memory, assists Quark in his endeavor.
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.