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Abandoned, The
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A Boslic Captain talks Quark into purchasing the wreckage of a ship that crashed in the Gamma Quadrant. Unfortunately, he ends up with much more than he bargained for when he finds a newborn alien...

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Accession
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A centuries old Bajoran vessel mysteriously exits the wormhole, and its passenger, a legendary Bajoran named Akorem Laan, is immediately beamed to the Infirmary. Shocked to learn that more than...

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Adversary, The
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During a party celebrating Sisko's promotion to Captain, Admiral Krajensky takes him aside and quietly reveals that there has been a coup on the Tzenkethi homeworld that could threaten Federation...

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Afterimage
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In addition to coping with the memories of her "past lives," Ezri Dax must deal with the range of reactions her presence generates on Deep Space Nine. Kira awkwardly tries to make conversation;...

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Algorian Mammoth
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A large woolly mammal of this world. Garak once absorbed 30 cc's of an anesthetic that would have knocked out such a beast, according to Bashir.

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Aliens, Thed
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It may or may not be species-related, but suspicious character Villus Thed has short-range telepathic powers up to five meters away.

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Alternate, The
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Dr. Mora Pol, the Bajoran scientist who studied Odo after he was discovered, arrives on Deep Space Nine with the announcement that he may have a clue to Odo's origins. The scientist's presence...

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Altorans
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Origin: unknown. Rumored to be traders with the Miradorn species.

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Alvanian Cave Sloth
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Another animal from this world, known for its deep sleep.

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Apocalypse Rising
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Sisko approaches Starfleet Command with Odo's suspicion that Gowron, the Klingon leader, is really one of Odo's people — a Changeling. Sisko is then instructed to expose the Changeling. He...

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Arbazan
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Planet: Arbaza A humanoid race (pronounced "ARR-buh-zahn"), mostly distinguished in appearance by a high forehead hairline. The word is used as both the adjective and with "the" as the noun for...

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Argelians
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Planet: Argelius II. Despite the hedonistic nature of the natives of Argelius II, their planet has long been known as a friendly shore-leave spot for Starfleet — even after the murderous...

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Argosian
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Planet: Argosia. An alien species, one member of whom once threw a drink in Commander Sisko's face and nearly caused a brawl to break out.

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Argrathi
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A humanoid people whose government, the Argrathi Authority, punishes offenders by enforced, virtual memories of a prison stay modeled to fit their personalities. Perhaps a bit jumpy, they grew...

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Armageddon Game
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Bashir and O'Brien travel to a lab orbiting T'Lani III in an effort to eliminate the Harvesters — a deadly bio-mechanical weapon used in the centuries-long war between the Kellerun and...

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Ascent, The
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Odo is dispatched to escort Quark to a Federation Grand Jury hearing, an eight-day journey away. Halfway to their destination, Quark hears a strange buzzing noise. When he and Odo investigate,...

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Assignment, The
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Meeting Keiko upon her return from Bajor, O'Brien is shocked when his wife says, in her own voice, that she is really an entity that has taken possession of Keiko's body and is holding her...

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Avianoid Aliens
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Members of this unspecified humanoid species distinguished by white, shaggy hair and a beak-like mouth continuing up into a Klingon-like forehead ridge are seen frequenting DS9. One wealthy native...

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Babel
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Frustrated by the mechanical problems on the space station, O'Brien attempts to fix the food replicators. Little does he know, an alien device has found a way into the station circuitry. For some...

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Badda-Bing Badda-Bang
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While relaxing in Vic's Las Vegas holosuite lounge, O'Brien and Bashir are surprised by the arrival of mobster Frankie Eyes, who announces that he's bought Vic's hotel. After Frankie fires...

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Bajorans
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Planet: Bajor Humanoid race, distinguished outwardly only by extra wrinkles at the bridge of the nose, have wandered the galaxy and settled on various worlds ever since their homeland was...

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Bajorans, Mirror Universe
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Planet: Mirror Bajor. The Bajorans in this continuum are a member of the Klingon-Cardassian Alliance, and as such have control of Terok Nor. Even these confident and self-assured Bajorans take...

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Bar Association
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After suffering for weeks with an ear infection without a day off, Rom finally collapses in Quark's bar and is taken to the Infirmary. Bashir is outraged that Quark refuses to give any employees...

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Bardeezans
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Planet: name unspecified. Space-faring race, otherwise nondescript, whose merchant ships have traversed the Bajoran wormhole into the Gamma Quadrant. One such ship left Deep Space Nine the night...

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Battle Lines
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Kai Opaka, Bajor's spiritual leader, pays a surprise visit to the station — her first journey away from her home planet. Sisko, Kira, and Bashir escort her on a tour of the station, and...

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Begotten
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The station is buzzing with the news that Kira has finally gone into labor. But Odo is surprisingly uninterested, having his own "baby" to deal with. The former Changeling has purchased an ailing...

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Behind the Lines
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Admiral Ross at Starbase 375 uncovers a major reason for the Dominion's dominance — a sensor array monitoring all activity across five sectors. Sisko soon formulates a risky plan to disable...

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Beneriam Hawk
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Planet: name unspecified. A predatory ornithoid life-form to whom Chief of Security Odo was compared on stardate 46853.2.

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Berellians
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Planet: name unspecified. A male of this unspecified race once lost to Jake in a game of Dom-jot, though Jake's girlfriend Marta called the game a hustle.

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Blaze of Glory
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A secret message is intercepted and delivered to Sisko. The few Maquis terrorists who have not been wiped out by the Dominion have initiated a massive retaliatory strike against Cardassia,...

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Blood Oath
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The relative calm of Deep Space Nine is shattered by the arrival of three aged Klingon warriors — drunken, overweight Kor; warlike Koloth; and their leader, Kang. The three came to find...

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Body Parts
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Quark returns from a visit to Ferenginar with the distressing news that he has Dorek Syndrome, an extremely rare disease that should end his life within a week. Since a Ferengi must pay off his...

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Bolians
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Planet: Bolarus IX A Federation race of humanoids, most distinguishable in appearance by the narrow yet distinctive ridgeline running at least from over the skull from the spine to the nose and...

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Boslics
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A humanoid spacefaring race whose freighter crew members, such as the male Tilikia and the female Rionoj, often visit DS9.

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Breen
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Planet: name unspecified. A humanoid species from a cold planet who operate in a politically non-aligned manner and are reputed to be aggressive, with outposts in Sector 97. It is presumed that...

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Broken Link
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Odo is rushed to the Infirmary when he suddenly collapses. After a thorough examination, Bashir determines that Odo is losing the ability to maintain his solid form, but it is unclear as to why....

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Business as Usual
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Quark's cousin Gaila arrives at the station with a business proposition. He offers a piece of his weapon-selling business to Quark — which would pay off all of Quark's debts within a month....

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By Inferno's Light
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As the station prepares for a Dominion attack, the enemy fleet coming through the wormhole suddenly turns toward Cardassian space. Gul Dukat breaks formation and follows, apparently bent on taking...

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Byzallians
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Planet: name unspecified. A species (pronounced "bye-ZAY-lee-uns') who asked that their scheduled Deep Space Nine conference be moved up a week circa stardate 48467.3.

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Byzatium
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Planet: name unspecified. Space-faring race (pronounced "bye-ZAY-tee-um"), otherwise nondescript, whose six such ships arrived at Deep Space Nine circa stardate 48467.3.

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Call to Arms
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When Starfleet Command notifies Sisko that he must stop further Dominion reinforcements from reaching Cardassia, he decides to mine the entrance to the wormhole — a move that will likely...

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Captive Pursuit
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While listening to a complaint about Quark's lascivious behavior from a Dabo girl, Sisko is alerted that an alien vessel is coming through the wormhole. The vessel contains a reptilian being named...

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Cardassians
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Planet: Cardassia   Tall, long-necked, humanoid in appearance, marked by several bony protrusions and ridges: one from the shoulder to under the ears, whose bottom lobes in turn are more...

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Cardassians
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Bashir is surprised when his "friend" Garak, a Cardassian tailor, is attacked and bitten by a Cardassian boy who is visiting the station with his Bajoran father. The boy, Rugal, is an orphan...

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Cardassians, Mirror Universe
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Planet: Mirror Cardassia. Cardassians would still seem to harbor the same attention to detail as ever in the Mirror Universe, where they likewise seem as efficient as always, whether in killing or...

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Carnivorous Rastipod
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Origin: Bajor. An animal reputed for a distinct lack of grace — apparently, a beast with two left legs.

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Change of Heart
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When Dax and Worf are sent to the Badlands to meet with a Cardassian double-agent, they receive an encrypted subspace transmission from Lasaran, the operative. He has information about where the...

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Changeling
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Origin: Gamma Quadrant Little is known about this strange race. They call themselves Changelings, a name adopted from others' use. The Changelings are the highest order in a Gamma Quadrant...

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Changeling, Evil
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Origin: The Gamma Quadrant. A character in a Yaderan tale retold by Taya to Constable Odo, somewhat reminiscent of the Terran Hindus' "Brahman and the Tiger." After powerful displays of morphing...

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Changing Face of Evil, The
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While Dominion and Breen commanders exult in their sneak attack, their supposed ally — Cardassian leader Damar — secretly plots to free his homeland from Dominion occupation....

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Children of Time
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In the Gamma Quadrant, Dax insists on investigating a planet surrounded by an energy barrier. But the barrier cripples the Defiant and causes Kira to be "duplicated" for a moment — she will...

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Chimera
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Odo returns from a conference with an unexpected guest: a Changeling who tracked and boarded his runabout. Odo recognizes him as one of "the hundred" shapeshifters who were, like himself, sent out...

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Chrysalis
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A group of genetically enhanced humans, once under Bashir's care, escape from their medical facility home in the hopes that the doctor — who himself was genetically engineered as a child...

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Circle, The
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After Minister Jaro dismisses Major Kira and sends her back to Bajor, Sisko angrily confronts him about his actions. Jaro is surprised that Sisko is not happy to be rid of his troublesome officer,...

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Civil Defense
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While working in the station's ore processing unit, O'Brien and Jake accidentally activate an automated Cardassian security program, which traps the pair and Sisko in the room. Throughout the...

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Collaborator, The
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Bajor is about to elect a new spiritual leader, and Kira's lover, Vedek Bareil, is the leading candidate, having been Kai Opaka's personal choice to succeed her. After spending time with Kira on...

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Covenant
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Vedek Fala, a Bajoran monk and Kira's former teacher, pays her an unexpected visit. He gives Kira a crystal which transports her to Empok Nor, where, to her horror, she is met by her old enemy...

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Coverians
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Planet: name unspecified. Space-faring race, otherwise nondescript, with three freighters once vying for the same docking port at Deep Space Nine.

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Crossfire
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First Minister Shakaar arrives at Deep Space Nine to negotiate for Bajor's early admittance into the Federation. The dignitary creates quite a stir around the station — especially with...

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Crossover
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After experiencing operational difficulties while traveling through the wormhole, Kira and Bashir find themselves in an alternate universe where the space station is populated by exact doubles of...

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Dal'Rok
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Planet: Bajor. A unique creature made of energy that is fabricated for five days of every year by the Bajoran Sirah to place two opposing villages against a mythical creature and thereby continue...

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Darkness and the Light
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Kira is shocked and saddened when Latha Mabrin, a fellow member of the Shakaar Resistance Cell-turned Vedek, is murdered. Kira's shock turns to fear, however, when she receives a recorded message...

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Dax
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Lieutenant Dax, preparing to return to her quarters for the evening, is being observed by a male Trill named Selin Peers. Ilon Tandro, a humanoid from Klaestron IV, joins him in the shadows....

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Defiant
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When Commander William Riker from the U.S.S. Enterprise visits the station, an intrigued Kira takes him on a tour, particularly of the Defiant. On the bridge of the docked ship, Kira uses her...

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Degebian Mountain Goat
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A sure-footed beast, exact origin unspecified, who could have gotten by on the narrow cliffside ledge that Kor did not trust while returning with the Sword of Kahless.

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Destiny
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In the wake of the peace treaty with Cardassia, Sisko is excited about working with two Cardassian scientists who are assigned to help deploy a subspace relay in the Gamma Quadrant — a...

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Die Is Cast, The
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After rejoining his former Cardassian mentor, Enabran Tain, Garak helps him in a joint mission with the Obsidian Order and the Romulan Tal Shiar. Tain has masterminded a plan to destroy the...

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Distant Voices
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An alien named Altovar approaches Bashir to obtain a restricted substance. The doctor refuses, prompting Altovar to later break into the Infirmary. Bashir arrives and tries to stop him, but the...

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Doctor Bashir, I Presume?
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Bashir is chosen as the model for the new version of Starfleet's holographic doctor program. Bashir is informed of the project by Doctor Lewis Zimmerman, the scientist in charge. As part of the...

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Dogs of War, The
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While Sisko takes command of a new ship named in honor of the Defiant, Kira, Garak and Damar barely escape a Dominion ambush on Cardassia and are forced into hiding. Quark receives a static-filled...

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Dolbargi
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A culture capable of a self-induced death-simulation technique that is teachable to and usable by others, including Hupyrians and Ferengi — as servant Maihar'du taught Grand Nagus Zek.

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Dominion, The
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Origin: Gamma Quadrant A mighty planetary alliance or trading consortium in the Gamma Quadrant, at first unknown to most beyond the wormhole.   Composed of "hundreds" of dominated races,...

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Dosi
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Reptiloid race of the Gamma Quadrant and client states to the Dominion who are profit-driven like the Ferengi but, in stark contrast, tend to violence. Known to Zek for its tulaberries and wine,...

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Dramatis Personae
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Kira protests when Sisko allows a Valerian ship to dock at the station, because she believes that the Valerians are supplying weapons-grade dolamide to the Cardassians. However, before the...

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Duet
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A Kobheerian freighter transports a passenger onto the space station who has a medical condition known as Kalla-Nohra. Kira recalls that the only cases of this were the result of a mining accident...

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Elaysians
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Planet: name unspecified. A space-faring humanoid people of a low-gravity world; only a handful have ventured off-planet, requiring the use of anti-grav wheelchairs whenever they leave. They have...

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Emissary, Part I
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For six days during Stardate 43997, Captain Jean-Luc Picard of the Starship Enterprise was held captive by a sinister race called the Borg. The Borg altered the captain's appearance and mind and...

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Emissary, Part II
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On a distant outpost at the edge of the final frontier, an untested crew embarks on an unprecedented journey. For six days during Stardate 43997, Captain Jean-Luc Picard of the Starship...

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Emperor's New Cloak
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Grand Nagus Zek, the ruler of the Ferengi empire and paramour to Quark and Rom's mother, disappears while on a business trip to the mirror universe. Ezri's counterpart from that universe...

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Empok Nor
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With Deep Space Nine in disrepair, O'Brien is unable to replicate the Cardassian materials he needs to fix it. He assembles a team of engineers and leads a salvage mission to Empok Nor, an...

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Ennis/ Nol-Ennis
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Origin: Gamma Quadrant. Two humanoid factions of the same species who fought for so long they were banished to a prison moon to continue their fighting, able to finally die only if they escape the...

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Equilibrium
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While experimenting with a keyboard, the musically untrained Dax inexplicably plays a melody she seems to remember from somewhere, then suddenly develops a short temper toward her fellow crew...

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Explorers
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Sisko returns from a trip to Bajor with the blueprint for an ancient space vessel that operates like a sailboat, using solar pressure for propulsion. According to legend, the Bajorans used these...

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Extreme Measures
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When Kira brings a terminally ill Odo back to the station for medical treatment, he orders her to leave him and return to help the Cardassian Resistance. Later, O'Brien and Bashir inform Sisko of...

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Facets
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Jadzia Dax prepares for her zhian'tara, the Trill Rite of Closure. During the ritual, Jadzia will meet Dax's previous hosts, which will be accomplished by transferring the memories of each into...

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Family Business
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In Quark's, an agent named Brunt from the Ferengi Commerce Authority (FCA) — their version of the IRS — serves Quark with a Writ of Accountability for improper supervision of a family...

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Far Beyond the Stars
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After a friend's ship is destroyed and Sisko considers leaving Starfleet, he begins having visions of his crew as 1950s Americans. Bashir's examination reveals unusual synaptic patterns, but...

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Fascination
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The Bajoran Gratitude Festival, an annual celebration, is about to get underway, and both Kira and O'Brien await the arrival of their loves. But while Kira's encounter with Bareil is sweet,...

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Favor the Bold
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The Federation continues to lose the war with the Dominion/Cardassian Alliance — and morale is sinking fast. Realizing that the Federation needs a major victory, Sisko launches a plan to...

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Ferengi
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The homeworld of the Ferengi species is Ferenginar. The Ferengi have a culture which is based entirely upon commerce. They follow a code of conduct known as "The Ferengi Rules of Acquisition."...

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Ferengi Love Songs
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Depressed over his lot in life — especially being blacklisted by the Ferengi Commerce Authority — Quark goes to his homeworld of Ferenginar for some comfort from his mother, Ishka. The...

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Field of Fire
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A young lieutenant named Ilario is found dead in his quarters. An investigation reveals he was shot by a TR-116 rifle, a weapon developed but never mass-produced by Starfleet. Meanwhile,...

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Flaxians
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Planet: Flaxia. The humanoid space-faring species of Retaya, a hitman associated with the Romulan Tal Shiar who attempted to kill Elim Garak. Flaxian assassins are known to favor a pheromonic...

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For the Cause
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With the conflict between the Klingons and the Cardassians taking its toll, a shipment of desperately needed replicators destined for Cardassia is set to pass through Deep Space Nine. Odo and...

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For the Uniform
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Sisko encounters Michael Eddington, his former Starfleet Security Chief, who betrayed him and joined the Maquis. Obsessed with capturing the traitor, Sisko pursues him in the Defiant. But when...

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Forsaken, The
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Bashir plays reluctant host to a delegation of Federation ambassadors, one of whom happens to be Lwaxana Troi, mother of the Enterprise's counselor, Deanna Troi. Lwaxana creates a scene in Quark's...

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Founders, the
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The ruling caste of the Gamma Quadrant's Dominion are the Changelings that spawned Odo. They intentionally kept their planet secret after a history of persecution by "Solids" that fueled their...

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Frunalian
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Origin: the Alpha Quadrant. An alien species which took an early scientific interest in the discovery of the Bajoran wormhole near the Deep Space Nine space station. This species has also...

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Galadorans
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Planet: name unspecified. Space-faring race which had no ship in Deep Space Nine's local sector at the time of Dukat's kidnapping in 2370 — a clue to confirming that a ship claiming to be of...

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Galipotans
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A space-faring race known for its "magnificent sweaters," in Garak's opinion, and a cultural refusal to acknowledge the concept of time — perhaps the reason its freighter is late one day at...

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