Star Trek: Deep Space Nine: The Complete Fourth Season

Sisko becomes uncomfortable when the Klingons station a task force to help defend against the Dominion. Worf is summoned to find out their true intentions.

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.

Bashir is asked to help a group of renegade Jem'Hadar break their addiction to ketracel white. Meanwhile Worf is dissatisfied with the way Odo runs security.

Kira and Gul Dukat go after the lost prison ship Ravinok. Dukat has a secret. Meanwhile Kasidy Yates tries to find work near Bajor, leaving Sisko uncomfortable.

Lenara Kahn, the new host of the wife of Dax's former host Torias, comes to the station. While they're not allowed to renew their relation, there's still a spark.

Quark and Rom take Nog to Earth and Starfleet Academy, but a malfunction with the ship takes the crew back in time, to Roswell, New Mexico in 1947.

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

Worf, Dax and the Klingon Dahar master Kor set out to find an ancient lost relic: the Sword of Kahless.

When a transporter emergency turns the command crew into holosuite characters, Bashir's James Bond fantasy takes on a deadly reality.

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

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

First Minister Shakaar visits the station, despite a threat of assassination. He falls in love with Kira much to Odo's dismay.

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 Worf destroys a civilian shuttle during an engagement with the Klingons, an extradition hearing is held to see if he must face charges.

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

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.

Sisko must face betrayal when evidence surfaces that Kasidy is smuggling for the Maquis. Meanwhile Garak makes acquaintance with Ziyal.

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.

Bashir tries to help a planet in the grips of a Dominion-engineered plague that guarantees a painful death.

Quark believes he's going to die, and Rom convinces him to sell his remains. After an accident, Bashir must move Keiko's fetus to Kira's womb.

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.