Star Trek: Deep Space NineSeason 4

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Season 4 of Deep Space Nine marks a major shift for the series, as it introduces a new conflict between the Federation and the Klingon Empire, sparked by the latter's distrust of the shape-shifting Founders. Worf, the former security chief of the USS Enterprise-D, joins the station's crew as Sisko's strategic operations officer, and faces challenges in his loyalty, honor, and family.

Where to Watch Star Trek: Deep Space Nine • Season 4

25 Episodes

The Way of the Warrior
E1
The Way of the WarriorStardate: 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.
The Visitor
E2
The VisitorStardate: 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.
Hippocratic Oath
E3
Hippocratic OathStardate: 49066.5. 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.
Indiscretion
E4
IndiscretionStardate: Unknown. 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.
Rejoined
E5
RejoinedStardate: 49195.5. 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.
Starship Down
E6
Starship DownStardate: 49263.5. A damaged Defiant must play a dangerous game of cat-and-mouse with two Jem'hadar ships inside a gas giant.
Little Green Men
E7
Little Green MenStardate: Unknown. 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.
The Sword of Kahless
E8
The Sword of KahlessStardate: Unknown. Worf, Dax and the Klingon Dahar master Kor set out to find an ancient lost relic: the Sword of Kahless.
Our Man Bashir
E9
Our Man BashirStardate: Unknown. When an transporter emergency turns the command crew into holosuite characters, Bashir's James Bond fantasy takes on a deadly reality.
Homefront (1)
E10
Homefront (1)Stardate: 49170.65. Sisko travels to Earth when a bombing at a Federation conference is determined to be the work of Changelings.
Paradise Lost (2)
E11
Paradise Lost (2)Stardate: Unknown. When Starfleet institutes martial law to combat the Changeling Menace, Sisko begins to question if the Dominion is the real threat.
Crossfire
E12
CrossfireStardate: Unknown. First Minister Shakaar visits the station, despite a threat of assassination. He falls in love with Kira much to Odo's dismay.
Return to Grace
E13
Return to GraceStardate: Unknown. 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.
Sons of Mogh
E14
Sons of MoghStardate: 49556.2. 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.
Bar Association
E15
Bar AssociationStardate: Unknown. 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.
Accession
E16
AccessionStardate: Unknown. 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.
Rules of Engagement
E17
Rules of EngagementStardate: 49665.3. When Worf destroys a civilian shuttle during an engagement with the Klingons, an extradition hearing is held to see if he must face charges.
Hard Time
E18
Hard TimeStardate: Unknown. O'Brien tries to re-integrate to life on the station after serving 20 years in a virtual prison.
Shattered Mirror
E19
Shattered MirrorStardate: Unknown. When the Mirror Universe counterpart of Sisko's deceased wife lures Jake to the other side, Sisko must follow and help the human resistance against the Alliance's forces.
The Muse
E20
The MuseStardate: Unknown. 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.
For the Cause
E21
For the CauseStardate: Unknown. Sisko must face betrayal when evidence surfaces that Kasidy is smuggling for the Maquis. Meanwhile Garak makes acquaintance with Ziyal.
To the Death
E22
To the DeathA renegade group of Jem'Hadar have captured a Gateway, a device allowing instantaneous transport virtually anywhere. Sisko must lead a combined task force of Federation, Bajoran and loyal Jem'Hadar fighters to destroy the Gateway before it can be used on missions of conquest.
The Quickening
E23
The QuickeningStardate: Unknown. Bashir tries to help a planet in the grips of a Dominion-engineered plague that guarantees a painful death.
Body Parts
E24
Body PartsAfter a visit to his homeworld and finding out about his impending doom, Quark ponders auctioning off his body parts. Meanwhile, an accident while traveling through the wormhole transfers Chief O'Brien's unborn son from his wife to Major Kira.
Broken Link
E25
Broken LinkStardate: 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.