Dukat returns, stripped of his prestige, to escort Kira to a Cardassian conference about the Dominion. But an attack by a Klingon raider may give Dukat a chance to redeem himself in the eyes of his government.
Worf's brother Kurn asks him to perform a death rite to regain his lost honor. Meanwhile, Kira and O'Brien investigate Klingon activity near the Bajoran border.
Unfair working conditions and pay cuts cause Rom to organize a union of the employees of Quark's Bar. Meanwhile, Worf still finds it hard to settle on the station.
A man claiming to be the emissary comes through the wormhole. Sisko is happy to give up his position. Meanwhile Keiko returns and O'Brien stops spending time with Bashir.
When the Mirror Universe counterpart of Sisko's deceased wife lures Jake to the other side, Sisko must follow and help the Terran resistance against the Alliance forces.
A mysterious woman approaches Jake about his future as a writer. Odo promises to do whatever it takes to help Lwaxana Troi keep her baby over the father's wishes - even if it means marrying her himself.
A renegade group of Jem'Hadar plunders Deep Space Nine. Sisko agrees to a combat operation with loyal Jem'Hadar to prevent the renegades completing a planetary gateway.
Odo is suddenly struck by illness. He is barely able to hold shape. Bashir and Odo see no other alternative than going to the Founders. Garak wants to come along.
With the war between Klingons and Federation intensifying, Sisko must make a plan to expose Gowron as a changeling. Odo is still having trouble with becoming a solid.
The crew is forced to retreat in a crashed Jem'Hadar ship after an attack by the Jem'Hadar. They get the feeling there's something very important about this ship.
Sisko tells two men from Temporal Investigations how he and his crew went back in time to when Captain James Kirk of the first Starship Enterprise exposed a Klingon spy with the help of Tribbles.