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December, 1967
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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Tribble
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Origin: unspecified. A small animal characteristically soft, furry, and pleasing to most humanoids (with the exception of Klingons). Tribbles give off a soft purring sound that is...

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December, 1990
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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April, 1992
Kriosians
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Planet: Krios. The tall, slender humanoid members if this species share similarities in their skin pigments — a dark-spotted, skin pattern along the hairline and down the neck and spine...

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January, 1993
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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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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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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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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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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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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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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Garanian Bolites
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Extremely small creatures which act as irritants when they come into contact with humanoid skin, as two unsuspecting Bajorans learned due to a trick played on them by Jake and Nog in 2369.

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Hunters
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Origin: unknown planet in the Gamma Quadrant. A humanoid race who live to pursue the Tosk in an endless life-and-death hunt, never contacted again after a single incident on DS9 in 2369 soon after...

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Joranian ostrich
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Planet: name unspecified. An alien ornithic species with an extremely fearful disposition. Fear has developed notable evolutionary flaws in the species; if frightened, the Joranian ostrich is...

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Man Alone, A
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The adjustment period aboard Deep Space Nine continues as transplants from across the galaxy attempt to come to terms with their new life and each other. O'Brien's wife Keiko misses the U.S.S...

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Past Prologue
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Dr. Bashir is excited to meet Garak, the last Cardassian aboard Deep Space Nine and a rumored spy. He rushes to tell the rest of the crew, but they are busy rescuing a Bajoran, Tahna Los, whose...

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Prophets
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Origin: Bajoran wormhole According to Bajoran religious doctrines, the prophets are the spiritual protectors and guides to the Bajoran peoples. Throughout Bajoran history, several unusual...

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Symbionts, Trill
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Only 300 symbionts are available for hosting each year on average. If a host is weak, the personality of the symbiont will overwhelm it. Unless its current Joined Host objects, a prospective Host...

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Tosk
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Origin: Gamma Quadrant A reptilian race, bred by unspecified eugenicists to enjoy being hunted and provide as exciting and interesting a chase as possible. They live only to outwit their Hunters...

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Trunkhead Aliens
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Planet: unspecified. Commonly seen in Federation faciliities such as DS9. A dull brown-skinned race with pointed upswept ears and a long, trunk-like, fleshy protrusion from the back of the skull...

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Vulcans
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Planet: Vulcan A humanoid race, with copper-based blood, slightly green-tinted complexion and notably pointed ears, they are responsible in a large part for the founding of the Federation. Over...

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Wormhole Aliens
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Origin: The Bajoran wormhole. Non-corporeal, non-linear telepathic race who built the wormhole adjoining Bajor some 10,000 years ago and worshiped by the natives there as "The Prophets" because of...

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February, 1993
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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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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Klaestronians
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Planet: Klaestron IV. An advanced space-faring humanoid race that is distinguishable in appearance by an ear ridge that comes forward to the eye, raising the hairline over the ear. The world was...

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Kobliad
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Origin: unspecified planet near the Bajoran system. Dying humanoid space-faring culture near the Bajoran system (pronounced "KOH-blee-add") who use Federation-supplied deuridium to stabilize their...

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Passenger
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Traveling in a runabout, Kira and Bashir pick up a distress signal from a disabled Kobliad ship. They beam over to discover an injured Kobliad woman named Ty Kajada, a security officer. Her...

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Q-Less
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Returning from a mission to the Gamma Quadrant on the other side of the wormhole, Lieutenant Dax and an ensign are trapped in their Runabout. While O'Brien works to free them, Dr. Bashir sees...

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Verathans
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Origin: the Gamma Quadrant. A humanoid race (pronounced "vuh-RATH-uns") whose civilization reached its height 30,000 years ago, spanning over two dozen systems interconnected with a highly...

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Yridians
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Planet: name unspecified. This wrinkly-skinned alien species famed as information merchants was known to the Vulcans before humans, at least in the altered but impermanent future during Archer's...

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March, 1993
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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Hupyrians
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Planet: name unspecified. A tall, facially-wrinkled, white-skinned, mute, humanoid species, many members of whom can be found working for important Ferengi officials because the Hupyrians have a...

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Move Along Home
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Commander Sisko, in dress uniform, prepares to receive the first formal alien delegation from the Gamma Quadrant — a group from a newly discovered species known as the Wadi. Sisko, Kira,...

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Tarahongians
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Planet: name unspecified. A people (pronounced "tair-uh-HONG-ee-uns") who are naturally gullible — at least according to Quark, who shrugs off Grand Nagus Zek's praise at selling their...

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The Nagus
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It's business as usual for Quark at his bar, until he is approached by a Ferengi named Krax, who presents his father, Grand Nagus Zek, the elderly, shrewd, revered leader of the Ferengi business...

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Wadi
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Origin: Gamma Quadrant Space-faring and game-loving humanoid race (pronounced "WAH-dee") from an unspecified planet whose people are the first formally known to be contacted from the Alpha-Beta...

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April, 1993
Altorans
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Origin: unknown. Rumored to be traders with the Miradorn species.

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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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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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Miradorn
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Planet: name unspecified. A race (pronounced "MEER-a-dorn") in which all are twins who make up a single self as two halves of one being — a "quarrelsome people," according to Quark. Natives...

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Rakhari
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Planet: Rakhar, Gamma Quadrant. Humanoid race distinguished by heavy ridges down the nose and full heads of bushy hair. Aware and unafraid of space-farers, they cared little about outside contact...

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Vanoben
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Planet: name unspecified. The otherwise nondescript home (pronounced "van-NOBB-un") of a transport ship raided only two light years from Deep Space Nine, when an artifact similar to one being...

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Vortex
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While haggling with a pair of twinned Miradorns over a valuable goblet for which he had agreed to provide a buyer — until learning that the artifact in question may have been acquired...

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May, 1993
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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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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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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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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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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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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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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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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Gunji jackdaw
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Origin: Alpha Quadrant. A species resembling an ostrich, spotted on Deep Space Nine's Promenade on stardate 46853.

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If Wishes Were Horses
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While Sisko, Kira, and Dax investigate readings of unusually high thoron emissions coming from the plasma field in their area of space, O'Brien reads his daughter Molly a bedtime story about...

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Kaleans
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Origin: unknown. An unfriendly group of this race (pronounced "CAL-ee-uns"), once confronted Curzon Dax and Commander Sisko on Rochani III.

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Liseppians
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Planet: Liseppia. A humanoid, non-aligned space-faring race distinguished by finger-like projections from the chin downward and a large, hard-skinned bare head with a pattern of ridges radiating...

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Nehru Colony
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Origin: Federation colony near station Deep Space 9 and the Bajoran system. Contacted via subspace link under the orders of science officer Jadzia Dax in 2369, in an attempt to rescue the...

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Progress
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With the Federation's help, the Bajoran government is about to perform a massive energy transfer by tapping the molten core of its fifth moon, Jeraddo. In preparation, Kira and Dax make an orbital...

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Saltah'na
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Origin: Gamma Quadrant. An ancient race (pronounced "sul-tu-NAW") that was entirely destroyed by a massive power struggle. The events were described in a telepathic archive contained in energy...

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Storyteller, The
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Sisko and Kira play host on the space station to the leaders of two rival Bajoran factions — the Paqu and the Navot. Sisko has stepped in to mediate their land dispute in an effort to avert...

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Valerians
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Origin: unknown. This humanoid space-faring race of the Alpha Quadrant delivered weapons-grade dolomide to the occupying Cardassians on Bajor and were suspected of still doing so in 2369 at DS9,...

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Wanoni Tracehound
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Planet: name unspecified. An predatory animal life-form rumored to take great pleasure in the pursuit of its prey. On stardate 46925.1, Constable Odo was heard comparing the romantically...

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June, 1993
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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In the Hands of the Prophets
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While Keiko O'Brien is teaching her students about the scientific aspects of the wormhole, a Bajoran woman in religious garb, Vedek Winn, observes the class and calmly objects to Keiko's secular...

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Kobheerians
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Planet: name unspecified. The bald, reptilian-skinned space-faring race resembling Liseppians and Dopterians with a skull-encircling ridge are a common trader with Cardassia Prime directly.

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September, 1993
Homecoming, The
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Kira is intrigued when Quark presents her with an earring he claims was delivered from Cardassia IV. She immediately recognizes the earring as that of Li Nalas, who according to legend is the...

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Yelikans
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Planet: name unspecified. Space-faring culture with a transport set for departure from Deep Space Nine in 2370, when Minister Jaro announced Kira's recall to Bajor.

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October, 1993
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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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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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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Invasive Procedures
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A violent plasma storm leads to the evacuation of Deep Space Nine, leaving a skeleton crew behind to maintain the station. Odo is suspicious when he learns that Quark is hiding in an airlock, but...

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Invernians
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Planet: Invernia II. Apparently humanoid species (pronounced "ihn-VUHR-nee-ahnz") and linked to the United Federation of Planets by treaty, possibly as members. A native girl about 10 died while a...

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Melora
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The crew welcomes Ensign Melora Pazlar, a cartographer on a mission to chart the Gamma Quadrant. Melora is an Elaysian, a species from a planet with very low gravity, and because of this, she must...

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Oxygenes
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Origin: unspecified. By implication, an oxygen-breathing species otherwise unspecified but apparently of Alpha or Beta quadrant origin. The species was known to Curzon or a previous Dax host,...

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Siege, The
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With less than five hours remaining before Bajoran forces are due to arrive, Sisko continues to evacuate Deep Space Nine. He elects to remain aboard to delay the station takeover, and is pleased...

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November, 1993
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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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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Halanans
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Planet: Halana. Humanoid and perhaps dark-skinned natives of Halana who rejoiced over Dr. Seyetik's terraforming of the paradise-like New Halana. They mate for life and carry abilities of...

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Morn
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The ubiquitous alien and Quark's most frequent patron. His affection for Phalosian, adult holosuites, is well known to Quark, and he's the first to try out a new cycle Quark obtains circa stardate...

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Necessary Evil
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A beautiful Bajoran woman, Pallra, calls Quark to Bajor and persuades him to retrieve a strongbox her late husband kept hidden on Deep Space Nine. He agrees, unaware that a stranger named Trazko...

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Reegrunion
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Planet: name unspecified. Species of illegal arms trader Plix Tixiplik.

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Rules of Acquisition
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While engaging in a game of Tongo with Rom, Dax, and a young Ferengi waiter named Pel, Quark is hailed by his leader, Grand Nagus Zek, who has good news for him — Zek has chosen him to act...

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Sanctuary
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When a ramshackle alien vessel is detected making its way through the wormhole, the ship's four passengers are transported to Deep Space Nine. The humanoid aliens, led by a female named Haneek,...

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Second Sight
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On the fourth anniversary of his wife's death, Sisko takes a melancholy late-night stroll along the Promenade, where a lovely alien woman named Fenna engages him in conversation. Strangely,...

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Skrreea
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Origin: Gamma Quadrant. A matriarchal humanoid Gamma Quadrant race dominated for 800 years by the T-Rogorans and forced to work as laborers and servants until the captors themselves were conquered...

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T-Rogorans
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Origin: Gamma Quadrant. A Gamma Quadrant race who ruled the Skreea for 800 years and killed the matriarchal people's leaders until they in turn were invaded and conquered by some "member" of the...

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January, 1994
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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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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Kelleruns
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Planet: name unspecified. Humanoid, advanced space-faring species, native to the Alpha Quadrant. Having just ended a centuries-old war with the T'Lani, which included use of the Harvester...

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Pythrons
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Planet: Pythron V. A space-faring race.

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Rivals
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Over a drink at Quark's, a middle-aged alien widow, Alsia, tells an alien man, Martus, how she plans to invest her life savings in a large mining concession. Just as Martus offers to become her...

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February, 1994
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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Initiate
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Another term for potential Trill host candidates.

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Paradas
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Planet: exact name unspecified. Humanoids with upswept, line-textured faces and skin almost resembling some Terran mollusks or seashells. As a species, they give off an odor from skin secretions...

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Paradise
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While surveying nearby star systems for M-Class planets, Sisko and O'Brien locate a planet that already supports a colony of humans. They transport to the surface, and learn that none of their...

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Playing God
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Arjin, a Trill initiate trying to qualify for joining with a symbiont, is nervous that he must study under Dax, having heard horror stories about the tough-as-nails Curzon and other...

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Shadowplay
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In the Gamma Quadrant, Dax and Odo detect an unusual particle field on the surface of an unexplored planet. Transporting to the source, they find an alien village and some kind of reactor emitting...

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Whispers
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After returning from an assignment in the Paradas system, O'Brien notices that everyone on the station is treating him differently. His wife, Keiko, acts strangely distant towards him and meets...

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