The fourth season of Deep Space Nine marks a bold shift in tone and direction, with the arrival of Worf, a stronger emphasis on the Dominion threat, and a vivid focus on the Klingons.

The season opens with a feature-length premiere that pits the Klingons and Federation against each other, presenting war between the two races for the first time in decades. As a result, Dukat’s relationship with the station becomes less adversarial – for the moment – while the Cardassians aid in the war against the Klingons. New dimensions are presented for this primary antagonist, with layers of comedy, humility, and love added to this highly complex character as he sees a fall from grace following the discovery of his half-Bajoran daughter.

The season introduces several recurring characters that will appear through the remainder of the show’s run, including Leeta, General Martok, Weyoun, Liquidator Brunt, and Sisko’s father.

4-01: The Way of the Warrior, Part I

When a Gowron-lead fleet of Klingon attack ships arrives at DS9, Sisko calls in a familiar Klingon expert for reinforcement.

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4-02: The Way of the Warrior, Part II

DS9 is center ground as the Klingon conflict intensifies. Gowron tries to persuade Worf and the Defiant rescues a Cardassian convey carrying Gul Dukat.

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4-03: Hippocratic Oath

Captured by a renegade group of Jem’Hadar, Miles and Bashir quarrel whether to help them break their addiction to Ketracel-white.

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4-03: The Visitor

When a freak accident traps Sisko in a time paradox, only re-appearing every few years, Jake spends the remainder of his life trying to save him.

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4-04: Indiscretion

Unbeknownst to Kira, Dukat has a secret agenda when he offers to assist rescue survivors of The Ravinok.

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4-05: Rejoined

Jadzia fights temptation when she is reunited with the new host of Torias Dax’s widowed wife.

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4-06: Starship Down

Upon rescuing an alien ship, The Defiant is badly crippled by the Jem'Hadar and becomes trapped in a gas atmosphere.

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4-07: Little Green Men

Quark, Rom, and Nog accidentally transport themselves back to the Roswell Incident on Earth in 1947.

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4-08: The Sword of Kahless

Worf and Jadzie set out with the legendary Kor to find the ancient bat'leth of Kahless.

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4-09: Our Man Bashir

A transporter mishap converts several crewmembers into spy-themed holosuite characters, with their true memories erased and their lives linked directly to the program.

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4-10: Homefront

Jake tags along when Sisko and Odo head to Earth to shore up defenses against a likely Changeling invasion.

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4-11: Paradise Lost

Paranoia swarms as Sisko and Odo work to prevent a military power-grab at Starfleet Command, while the Defiant is believed to have been overtaken by Changelings.

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4-12: Crossfire

Odo becomes agitated when witnessing Kira and Shakaar’s blossoming love.

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4-13: Return To Grace

Kira assists Gul Dukat, now in command of a freighter, to stop a Klingon Bird-of-Prey that destroyed an outpost with a joint Bajoran and Cardassian delegation.

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4-14: Sons of Mogh

Worf's disgraced brother comes to DS9 seeking an honorable death.

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4-15: Bar Association

Quark’s frustrated employees organize a union and strike, prompting intervention from Liquidator Brunt of the Ferengi Commerce Authority.

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4-16: Accession

A survivor found aboard an ancient Bajoran ship claims to be the true Emissary of the Prophets.

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4-17: Rules of Engagement

Worf faces a tribunal for destroying a ship of Klingon civilians.

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4-18: Hard Time

Miles struggles re-adjusting to normal life after having the realistic memories of serving a long, difficult prison sentence transplanted into his mind.

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4-19: Shattered Mirror

The mirror Jennifer Sisko lures Jake and Benjamin to the alternate universe to assist with building another U.S.S. Defiant.

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4-20: The Muse

Jake is under an alien influence while a pregnant, engaged Lwaxana Troi seeks Odo's help.

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4-21: For The Cause

Sisko's loyalties are tested when his girlfriend, Kassidy Yates, is an accused Maquis collaborator.

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4-22: To The Death

Sisko and crew assist Weyoun track down a renegade Jem'Hadar group who have located an Iconian gateway.

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4-23: The Quickening

Against great odds, Bashir tries to cure a deadly alien disease.

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4-24: Body Parts

After news of Quark’s imminent death proves false, Quark hires Garak to kill him to honor the completed sale of his body parts.

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4-25: Broken Link

When Odo is struck with an unknown illness, Sisko seeks help from The Founders, who enact a punishment against Odo for harming another Changeling.

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