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: Unknown. Melanie, an aspiring writer, wants to know why Jake Sisko stopped writing at 40. Jake tells how his father died in an accident and then suddenly reappeared.

Stardate: 49011.4. When the Klingons bring a task force to DS9, Captain Sisko sends for Starfleet's lone Klingon officer, Worf, to uncover the mysterious intentions of their presence.

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: Unknown. Now rejoined with his former mentor, Garak is ordered to interrogate Odo about the secrets of his people, while the joined Romulan/Cardassian attack fleet moves towards the Founders' home world on a mission of destruction.

Stardate: Unknown. Sisko leads, what he hopes will be, a final all-out assault on Cardassia Prime. Kira and Garak mount a suicidal assault on the Cardassian headquarters occupied by the Dominion, who in turn kill innocent women and children village by village in retaliation for the Resistance's attacks.

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. The Federation's only hope of stopping massive Dominion reinforcements from entering the Alpha Quadrant relies on Sisko's suicide mission to reach DS9 before the minefield is destroyed.

Stardate: Unknown. Captain Sisko has a full sensory vision of himself as an under-appreciated science fiction magazine writer in 1950s America.

Stardate: Unknown. After an attempt is made on Garak's life, Odo conducts the investigation on who tried to murder the Cardassian tailor - and why.

Stardate: 49263.5. A damaged Defiant must play a dangerous game of cat-and-mouse with two Jem'hadar ships inside a gas giant.

Stardate: 51721.3. To save the Federation in a critical scheme, Sisko comes to realize that he must violate its fundamental principles to do so.

Stardate: Unknown. Sisko and Quark and a strange telepathic woman are arrested by Jem'Hadar, soldiers of the Dominion.

Stardate: 48213.1. Instead of waiting for the Jem'Hadar to attack, Sisko wants to try a different approach. He wants to take a new class starship to try to find the Founders.

Stardate: Unknown. When Starfleet institutes martial law to combat the Changeling Menace, Sisko begins to question if the Dominion is the real threat.

Stardate: 52902.0. As the war careens toward a final showdown on Cardassia, Sisko's definitive action as the Emissary draws near.

Stardate: Unknown. Dr. Bashir fights to save Garak's life when a malfunctioning Cardassian brain implant threatens to kill him.

Stardate: 48213.1. Odo has found his home and is introduced. Meanwhile Sisko finds out peace talks between the Dominion and the Federation have already started.

Stardate: 48959.1. The Defiant is off to show the Federation's presence to the new Tzenkethi government. While underway the ship malfunctions and Bashir is suspected of sabotage.

Stardate: 49170.65. Sisko travels to Earth when a bombing at a Federation conference is determined to be the work of Changelings.

Stardate: Unknown. O'Brien tries to re-integrate to life on the station after serving 20 years in a virtual prison.

Stardate: 49962.4. Odo is suddenly struck by illness. He is barely able to hold shape. Bashir and Odo see no other alternative then going to the Founders. Garak wants to come along.

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.

A Cardassian suffering from Kalla-Nohra, a disease that indicates he served in a labor camp, visits DS9. Kira is determined to convict him as a war criminal.