Stardate: 4523.7. In this celebration of the 30th anniversary of The Original Series, the disgraced Klingon spy Darvin travels back in time to undo his century-old defeat by James Kirk. The DS9 crew must track him down and stop him, while blending in with the crew of the original Enterprise NCC-1701.

Stardate: 50975.2. Sisko decides to mine the wormhole to prevent further Dominion ships crossing into the Alpha Quadrant. This provokes an attack by the Dominion and the Cardassians, and a desperate last stand on Deep Space Nine.

Stardate: 50564.2. The station readies for a Dominion attack. Worf and Garak meet some unexpected friends in a Dominion Prison camp.

Stardate: Unknown. A coded message from the Gamma Quadrant leads Garak to believe his mentor, Enabran Tain, is still alive. He and Worf seek him out, only to discover something much worse: a Dominion invasion fleet poised to attack the Alpha Quadrant.

Stardate: Unknown. 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.

Stardate: 50814.2. The DS9 crew discovers a colony that, due to a time travel accident, turns out to be inhabited by the crew's own descendants.

Stardate: 50049.3. The crew find a crashed Jem’Hadar ship and work to repair it and capture it for the Federation, but are confronted by a Dominion force determined to recover the ship’s cargo.

Stardate: Unknown. The discovery of an infant Changeling gives Odo a chance to put right the trauma of his own upbringing, while his “father” Dr. Mora insists on a more clinical approach.

Stardate: 50485.2. When the traitorous Eddington returns, Sisko will go to any lengths to capture him.

Stardate: Unknown. Dr. Bashir is selected to be the model for the next-generation of Emergency Medical Hologram (EMH). But he balks when his parents are invited to the station to be interviewed by the EMH programmer, Dr. Zimmerman. There is a dark secret in his family that he's afraid that his parents will reveal.

Stardate: Unknown. While salvaging components from DS9's sister station, the crew run afoul of a "surprise" left behind by the Cardassians.

Stardate: Unknown. While Worf helps Quark to pursue his former wife Grilka, O'Brien and Kira grow uncomfortably close to each other.

Stardate: Unknown. Dax and Worf accompany Martok on his first command since being held by the Dominion. But the ship they are given hasn't seen victory in months and the crew is near mutinous.

Stardate: 50929.4. Jake has his heart set on a vintage Willie Mays baseball card as a present to cheer up his father, whose spirits are flagging from the ongoing conflict.

Stardate: Unknown. Jake, reporting from the front lines, sees what war truly is.

Stardate: Unknown. Sisko learns that the Maquis are planning a devastating attack on Cardassia, and must rely on the traitor Eddington to help him prevent it.

Stardate: Unknown. Sisko, Dax, Odo and Garak find themselves in the past when the Cardassians controlled the station, and a crime that Odo investigated may be the key.

Stardate: Unknown. When Odo and Quark crash land, they must put aside their differences to climb a mountain to signal for help. Jake and Nog try to be roommates, but their different styles clash.

Stardate: Unknown. An alien entity has possessed Keiko's body and is holding it hostage until O'Brien completes an assignment for it.

Stardate: Unknown. Quark must wrestle with his conscience when he becomes involved with arms merchants.

Stardate: Unknown. After a brain injury, Sisko begins experiencing powerful visions through time. He dives fully into the role of the Emissary, while becoming obsessed with finding a legendary Bajoran ruin.

Stardate: 50712.2. When a Cardassian official that thinks of Kira as his daughter is dying, he agrees to reveal all he knows to her. But the experience dredges up Kira's memories of her own father's death.

Stardate: 50416.2. A mysterious assassin begins wiping out all the members of Kira's old resistance cell.

Stardate: Unknown. Quark doesn't know whether to be panicked or overjoyed when he learns that his mother is the new lover of the Grand Nagus.

Odo helps a woman hiding on the station from organized criminals, but quickly develops a personal interest in the case.