After the discovery of the only known stable wormhole in existence Sisko is declared by the Bajorans to be "The Emissary", a long awaited messenger from their Holy Prophets, one to be revered.
The wormhole leads to the gamma quadrant of the galaxy and brings many new visitors to the area. Most are honest merchants and travelers but there are those who would seek to control access to the wormhole for their own gain.
The importance of the wormhole is not lost on our Commander. He will need mobility and the ability to fight. Sisko obtains a ship, The Defiant, and with her the title of Captain.
Some of those who come through the wormhole from the gamma quadrant do so for purposes of conquest.
Security Chief Odo gave up searching for other shapeshifters and thought himself unique in the galaxy until a hostile faction calling itself The Dominion came through the wormhole.
