An accident causes the crew to meet their own descendants - and presents them with an ethical dilemma.
An act of desperation by the Maquis could plunge the Federation into war.
The crew goes to Deep Space Nine's abandoned sister space station, Empok Nor, to salvage components.
Jake wants to give his dad a present to cheer him up.
Faced with the realisation that the Dominion are taking over the Alpha Quadrant, Sisko decides to mine the entrance to the wormhole.
Three months into the war, DS9 is still under Dominion control. Sisko and his crew are given a mission to destroy a vital facility deep in Dominion space.
Sisko and his tired crew crash on a planet where they encounter a band of Jem'Hadar.
While on General Martok's ship Worf is reunited with his estranged son, Alexander.
Sisko creates a risky plan to disable a critical Dominion sensor array, while on Terok Nor, Kira, Jake, Rom and Odo seek to undermine the Cardassian/Dominion Alliance.
Learning of thousands of Dominion reinforcements gathering in the Gamma Quadrant, Sisko initiates a plan to retake Deep Space Nine and secure the wormhole before the minefield is detonated. Odo's loyalty is caught between the female Changeling and Kira.
Sisko commands the Defiant and 600 Federation ships against a Dominion/Cardassian armada to retake Deep Space Nine. Damar has Kira, Jake, and Leeta arrested.
Worf's plans for a traditional Klingon wedding hinge on Martok's demanding wife accepting Dax into their family.
The mirror universe counterpart of Kira's dead love, Vedek Bareil, takes her hostage on Deep Space Nine as he is running from the evil Alliance of his universe.
Bashir attempts to reintegrate genetically-engineered misfits into society, but they are asked by Starfleet to become a think tank when they provide insightful analysis of upcoming Dominion peace talks.
Quark mounts a rescue mission when his mother, Ishka, is captured by the Dominion and Grand Nagus Zek offers a reward for her return.
Sisko meets with the former Cardassian leader Gul Dukat, now a prisoner, as he awaits a war crimes investigation.
Morn is killed in an ion storm and Sisko informs Quark that Morn left his entire estate to him. But Quark has a little competition...
After a friend's ship is destroyed, Sisko considers leaving Starfleet. Visions of himself as a science fiction writer in 1950s America affect his decision.
Dax, O'Brien, and Bashir board a Runabout, which is shrunken to four inches long as they investigate a rare subspace phenomenon.
Starfleet Intelligence recruits Chief O'Brien to infiltrate the Orion Syndicate to find a Starfleet informant.