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.

Season 4 Episode 9 - The Sword of Kahless

Stardate: Unknown. Worf, Dax and the Klingon Dahar master Kor set out to find an ancient lost relic: the Sword of Kahless. Air Date : 20th-Nov-1995

Season 4 Episode 1 - The Way of the Warrior (1)

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. Air Date : 2nd-Oct-1995  Read More

Season 4 Episode 2 - The Way of the Warrior (2)

Stardate: 49011.4. 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. Air Date : 2nd-Oct-1995  Read More

Season 4 Episode 3 - The Visitor

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. Air Date : 9th-Oct-1995  Read More

Season 4 Episode 4 - Hippocratic Oath

Stardate: 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. Air Date : 16th-Oct-1995  Read More

Season 4 Episode 5 - Indiscretion

Stardate: 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. Air Date : 23rd-Oct-1995  Read More

Season 4 Episode 6 - Rejoined

Stardate: 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. Air Date : 30th-Oct-1995  Read More

Season 4 Episode 7 - Starship Down

Stardate: 49263.5. A damaged Defiant must play a dangerous game of cat-and-mouse with two Jem'hadar ships inside a gas giant. Air Date : 6th-Nov-1995  Read More

Season 4 Episode 8 - Little Green Men

Stardate: 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. Air Date : 13th-Nov-1995  Read More

Season 4 Episode 9 - The Sword of Kahless

Stardate: Unknown. Worf, Dax and the Klingon Dahar master Kor set out to find an ancient lost relic: the Sword of Kahless. Air Date : 20th-Nov-1995  Read More

Season 4 Episode 10 - Our Man Bashir

Stardate: Unknown. When an transporter emergency turns the command crew into holosuite characters, Bashir's James Bond fantasy takes on a deadly reality. Air Date : 27th-Nov-1995  Read More

Season 4 Episode 11 - Homefront (1)

Stardate: 49170.65. Sisko travels to Earth when a bombing at a Federation conference is determined to be the work of Changelings. Air Date : 1st-Jan-1996  Read More

Season 4 Episode 12 - 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. Air Date : 8th-Jan-1996  Read More

Season 4 Episode 13 - Crossfire

Stardate: Unknown. First Minister Shakaar visits the station, despite a threat of assassination. He falls in love with Kira much to Odo's dismay. Air Date : 29th-Jan-1996  Read More

Season 4 Episode 14 - Return to Grace

Stardate: 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. Air Date : 5th-Feb-1996  Read More

Season 4 Episode 15 - Sons of Mogh

Stardate: 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. Air Date : 12th-Feb-1996  Read More

Season 4 Episode 16 - Bar Association

Stardate: 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. Air Date : 19th-Feb-1996  Read More

Season 4 Episode 17 - Accession

Stardate: 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. Air Date : 26th-Feb-1996  Read More

Season 4 Episode 18 - Rules of Engagement

Stardate: 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. Air Date : 8th-Apr-1996  Read More

Season 4 Episode 19 - Hard Time

Stardate: Unknown. O'Brien tries to re-integrate to life on the station after serving 20 years in a virtual prison. Air Date : 15th-Apr-1996  Read More

Season 4 Episode 20 - Shattered Mirror

Stardate: 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. Air Date : 22nd-Apr-1996  Read More

Season 4 Episode 21 - The Muse

Stardate: 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. Air Date : 29th-Apr-1996  Read More

Season 4 Episode 22 - For the Cause

Stardate: Unknown. Sisko must face betrayal when evidence surfaces that Kasidy is smuggling for the Maquis. Meanwhile Garak makes acquaintance with Ziyal. Air Date : 6th-May-1996  Read More

Season 4 Episode 23 - To the Death

Stardate: 49904.2. 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. Air Date : 13th-May-1996  Read More

Season 4 Episode 24 - The Quickening

Stardate: Unknown. Bashir tries to help a planet in the grips of a Dominion-engineered plague that guarantees a painful death. Air Date : 20th-May-1996  Read More

Season 4 Episode 25 - Body Parts

Stardate: Unknown. Quarks hears on Ferenginar he is going to die. Rom convinces him to sell his remains. After an accident, Bashir has to move Keiko's baby to Kira's womb. Air Date : 10th-Jun-1996  Read More

Season 4 Episode 26 - Broken Link

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. Air Date : 17th-Jun-1996  Read More