A reluctant Commander Benjamin Sisko arrives at Deep Space Nine, a former Cardassian space station, and discovers that it borders a unique stable wormhole leading to the Gamma Quadrant.
The Cardassians declare war, damaging the space station during the battle, but hostilities cease when Sisko returns with the missing Cardassian ship.
Mounting evidence points to Security Chief Odo as the murderer of a Bajoran criminal under investigation, and Keiko tries to establish a school.
Nate Haskell, the infamous `Dick and Jane' killer, kidnaps Langston's ex-wife and leaves a message written in blood.
Sisko undertakes a daring mission to reclaim DS9 before the minefield is destroyed, and Kira asks Ziyal to convince her father to release Rom.