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For other uses, see Unity.

Unity is a Star Trek: Deep Space Nine novel by S.D. Perry that was published by Pocket Books in 2003 in hardback and 2004 in paperback. It is the tenth novel in the DS9 continuity after "What You Leave Behind" and centers around Bajor's admission to the Federation and the Parasite threat.

Publisher's description

From the back cover

In 2001's critically acclaimed Avatar novels, author S.D. Perry set the tone and the course for the continuation of Star Trek: Deep Space Nine®, a controversial television phenomenon hailed by TV Guide as "the best acted, written, produced, and altogether finest" incarnation of Star Trek®. Since then, the DS9 saga has grown in complexity and momentum, attracting an ever-growing audience to novels about which one reviewer raved, "In these pages, DS9 truly lives again." Now, following her triumphs with Avatar and Rising Son, S. D. Perry returns for a landmark tale celebrating DS9's tenth anniversary year.

On the eve of Bajor's formal entry into the Federation, First Minister Shakaar was assassinated, derailing the induction and plunging the planet and station Deep Space 9™ into chaos. Investigation into the murder revealed the presence of a parasitic conspiracy threatening not only Bajor's future with the Federation, but the very survival of both. At the same time, the fracturing of Bajor's theology has put its people on the threshold of a startling transformation -- and the consequences now rest on the shoulders of Colonel Kira Nerys, who months ago defied the religious authority of her planet by making public an ancient heretical text that challenged the very foundation of the Bajoran faith.

Now, after a harrowing and historic voyage of exploration in the Gamma Quadrant, the weary, wounded crew of Starship Defiant is at last coming home. But the joy of their return is short-lived as the crew becomes swept up in the crisis aboard the station, with many of them confronting personal issues that force them to make life-altering choices. Among those is a grief-stricken Commander Elias Vaughn, who reaches a crossroads in his life's journey and learns the true purpose for which he was Touched by the well as the ultimate fate of Captain Benjamin Sisko.

And... somewhere on Bajor... a child long awaited is about to be born.


En route back to the Alpha Quadrant Commander Vaughn contemplates the successes and failures of the USS Defiant's three month voyage of exploration through the Gamma Quadrant. As the Defiant emerges from the wormhole it appears that the Bajoran system has been invaded by Cardassians. Vaughn attempts to get past their blockade by cloaking the Defiant, but is eventually ordered by Colonel Kira to stop. The Defiant docks and after being scanned by Cardassian personnel the command staff are briefed. The blockade was a test to make sure the Defiant was not under control of parasitic aliens which recently had been uncovered in the Alpha quadrant, these same parasites had attempted to gain control over Gul Macet but failed indicating that Cardassians were immune to their effects and hence Starfleet requested the Cardassians aid in enforcing a lockdown of the Bajoran system in an attempt to contain the aliens.

Following the briefing Ezri Dax informed Julian Bashir of Audrid Dax's past contact with the parasites a century earlier. (DS9 short story: "Sins of the Mother") Shar goes with his Zhavey Charivretha zh'Thane to his quarters to mourn with his remaining bondmates over the death of Shathrissia zh'Cheen and consider his bondgroup's future. Cyl tells Dax of his and Gards history as watchers of the parasites and Yevir arrives from Bajor to escort Opaka Sulan and Jake Sisko back. Vaughn also goes to Bajor under the guise of tracking down the assassins of Shakaar Edon but is in fact working on finding parasites amongst the Bajoran population. On Deep Space 9 Bashir has been researching the parasites and comes to the conclusion they are genetically engineered from trill symbionts.

Shar's remaining bondmates return to Andor to find new bond mates to produce a much needed child. Vaughn, under orders take medical leave at the monastery at Ashalla after finding himself emotionally exhausted in the wake of Ruriko's death and the renewed difficult relationship with his daughter Prynn. In Quark's, a parasite quite publicly attacks Taran'atar, who was outside Quark's having taken to hanging around with Wex. Taran'atar successfully prevented the parasite from taking control by chewing it to death. The carcass provides more to research on, but Bashir believes it's necessary to capture a queen parasite to move forward. At the edge of the lockdown Runabout Medeira containing the O'Brien and Sisko families is eventually allowed into the Bajoran sector with clearance from Kira. Near to Admiral Akaar's quarters Ro discovers a queen parasite in its Bajoran host and is attacked by its latest spawn. Hearing Ro's scream Shar and Nog dash to the rescue. Releasing all his Andorian rage Shar kicks the queen away and pulls the parasite from Ro's mouth, crushing it with his hands. As three more parasites approached a security team froze them and the queen with stasis field generators. In short, the team has captured a Queen. On Bajor, Vaughn under the watch of Opaka looks into the orb of Unity...

Eli Underwood is taken to Benny Russell to be shown around the asylum he was admitted into the night before. Benny and Eli quickly become friends.

In the security cells the senior staff are briefed by Dr. Bashir on his findings with the queen. Kira decides they need to try to communicate with the queen. Dax, Cyl and Gard all volunteer.

Gard is implanted with the parasite. In a brief conversation with Kira the queen declares "We know everything. You will destroy the Trill. You will leave us the wormhole and withdraw from this space. You will give us the bodies we need, or we will obliterate all you hold sacred and take what we want." She then tries to kill Gard but Bashir beams it out before it can do so, killing the queen in the process. Gard suggests the parasites have some interests in the tears of the prophets.

The queen's death starts off events on Deep Space 9 and Bajor. All the soldier parasites abandon their hosts on DS9 causing chaos and fear amongst the residents. Several Cardassians are injured. On Bajor a group of monks who had been camping out near Kasidy's house come to the home armed and kidnap Kasidy and the Sisko's. They leave Keiko and the children with a message to the Federation warning them not to interfere or face the consequences. The parasites/monks take Kasidy and the Siskos to Ashalla where other parasite have interrupted Vaughn's orb experience leaving him unconscious and injured after they shoot him.

Eli wakes up to find Benny at his side but the asylum otherwise empty. Benny tells him not to dwell on his past but think about the present and the two make their way out of the asylum.

On Bajor the parasites have taken hostages and control many major sites - the Chamber of Ministers, the Vedek Assembly, B'hala, the Central Archives and the Shrine at Kendra. Admiral Akaar contacts Kira and is outraged at her decision to authorize the queen's implantation on her own accord. He takes her out of the loop, putting himself in charge of DS9. Kira leaves Ro in charge of Ops and takes the Defiant under cloak to Bajor. With some technical help from O'Brien, Kira beams through the cloak to Ashalla and is immediately attacked by a horde of parasite-inhabited Bajorans. Just as she gives up all hope she is saved by Wex who, unbeknownst to her, beamed down in the form of her utility belt. Wex quickly reveals herself to be Odo and after a brief reunion the two part once more. Kira heads of to secure the orbs and Odo, in the form of a Po werm, goes to save the hostages.

Kira approaches the huge parasite spawnmother in the orb chamber and realises that on her own she can't stop it; the spawnmother is full of thousands of parasites and shooting her would release them to attack Kira and all of Bajor. Instead Kira opens up all of the orbs, flooding the queen's perceptions with the light of the orbs and the visage of Benjamin Sisko, who informs her she'd picked the wrong planet.

In a realm outside of normal spacetime a group of Jem'Hadar that moments prior were aboard the last ship of an armada heading for the Alpha quadrant find themselves in the void. After a brief period of confusion they hear the screams of the spawnmother and unsheathe their kar'takin, ready for battle...

On Deep Space 9 Merimark interrupts as Akaar prepares to put Ro in her place. After giving him the run around, she informs them that the hostage takers on Bajor have collapsed and the parasites are on the run. Eli-Elias Vaughn drifts out of consciousness into a battle of hostages killing off the fleeing parasites. Kasidy gives birth to her daughter Rebecca Jae and is reunited with Ben.

Weeks later, Quark has had his assets frozen by the Federation pending an investigation. His dream of leaving Bajor's soon to be moneyless economy behind is crushed. Kira comes into the bar and informs him Ferenginar has begun full diplomatic relations with Bajor and Quark's is to become the Ferengi embassy, making it officially sovereign territory of Ferenginar and as such subject to its laws and commerce practices, and so Quark as Ambassador to Bajor will be able to trade and earn profits within the Federation. With an encouraging note from Jean-Luc Picard and with the withdrawn objections of Admiral Akaar, Ro decides to stay on into Bajor's Starfleet era. Vaughn sows the seed of a renewed relationship with Prynn, determined not to let her slip out of his life again. Sisko returns to DS9 to applause and a well aimed baseball from Captain Kira and informs her he has turned down the admiralty and will be taking his life as it comes with his family.

On Bajor in front of thousands, the command staff of Deep Space 9 (past and present) stand alongside the command crew of the USS Enterprise-E, representatives of the Vedek Assembly and dignitaries from Andor, Trill, Cardassia, Qo'noS, Ferenginar and the Dominion to witness the signing ceremony for Bajor's admittance into the Federation.

In the home that Ben designed and Kas had built, Benjamin Sisko drifts off to sleep contemplating his return and his future responsibilities, the Prophets have given him much to do, to help friends and old and new...



Leonard James AkaarAsarem WadeenJulian BashirBellis NemaniBenningsSam BowersCaprilTaulin CylEran DalThavanichent th'DaniEzri DaxElim GarakHiziki GardGirani SemnaHanal'ahanKira NerysNatima LangLeetaMikaela LeishmanLenaris HolemLiro KaviAkellen MacetMartokKaitlin MerimarkMornMustata'klanNguyenNogKeiko O'BrienKirayoshi O'BrienMiles O'BrienMolly O'BrienOdo/WexOpaka SulanBryanne PermenterJean-Luc PicardQuarkVindizhei sh'RraazhRo LarenRomWilliam RossJason SenkowskiBenjamin SiskoJake SiskoJoseph SiskoJudith SiskoRebecca Jae SiskoTaran'atarThirishar ch'ThaneSimon TarsesPrynn TenmeiCharivretha zh'ThaneTigart HeddaTreirValast'avalElias VaughnVluWorfKasidy YatesYevir LinjarinYukei
Vaughn's orb experience
CassieLaurenLeoPriaRuriBenny RussellSamuelShilohSue-LynTerrenceEli Underwood
Referenced only 
Joe AdcockErnie BanksBareil AntosBroikShathrissia zh'CheenBeverly CrusherCylElista CylNeema CylReck CylDaxAudrid DaxCurzon DaxJadzia DaxJoran DaxTorias DaxSkrain DukatEtana KolVic FontaineFroolSeljin GandresGardVerjyl GardGranGrilkaGrimpTom HaversHetikIshkaItuEdgardo JuarezKileyKostazaThurgood MarshallWillie MaysM'PellaOhaluChristopher PikeWilliam RikerGerda RonessShakaar EdonShesaShul ToremSiSimon TarsesRuriko TenmeiTora ZiyalToshinT'PrynnDeanna TroiVodJayvin VodWeyounWinn AdamiJae YatesY'PoraZek


Alpha QuadrantAshallaBajorBajoran wormholeCelestial TempleChamber of MinistersDeep Space 9EarthGamma QuadrantIdran sectorIdran systemHedrikspool ProvinceKarnoth resettlement campoperations centerPromenadeQuark'sReplimatRiverdale Asylumsecurity officeSisko's HouseSpican JewelersTilar Peninsula
Referenced only 
Andevian IIAndorArgentinaBadlandsBajoran outbackB'halaBetazedCardassiaDenevaEbbets FieldEeEmpok NorFarius PrimeFerenginarHill ProvinceKendra ShrineKlabniaKoreaLyaMak'alaManark IVMexicoMinos KorvaMusilla ProvinceNew FranceRakantha ProvinceRaknal VRisaSeoulStarfleet HeadquartersTrillUnefra IIIVulcanWashington, DCXepolite

Starships and vehicles

USS Defiant (Defiant-class) • USS Gryphon (Akira-class) • hopperUSS Madeira (runabout) • Trager (Galor-class)
Referenced only 
USS AldebaranUSS Enterprise-EEven OddsKamalStarfleet classification 232

Races and cultures

Referenced only 
AscendantBorgChekaD'NaaliDrangEav'oqKlabnianKtarianNyazenPrentaraRomulanToskVulcanVahni VahltupaliYrythny

States and organizations

Bajoran MilitiaDominionFederation CouncilQuark Enterprises, Inc.Republic of BajorStarfleetTrill Defense MinistryUnited Federation of PlanetsWatchers
Referenced only 
Balinsta troupeCentral ArchivesChicago CubsCorps of DiscoveryEveste EldersGanses UniversityHunterInterstellar Agricultural Aid CommissionObsidian OrderOhalavaruOralian WayOrion SyndicateStarfleet AcademyTrill Symbiosis CommissionUnited States Navy

Science and technology

acetylcholineantigrav toolantiprotonbenzocyatizinecathedral artifactchronitoncloaking devicecombadgecomnetcomputercontrol panelcyatizinedocking pylonDNAelectromagnetic pulse generatorenvirosuitfood replicatorfusion coregenetic engineeringhairholovidhourHurricane Hildaisoboraminelife supportlindseyminefieldminuteorbOrb of ContemplationOrb of DestinyOrb of MemoryOrb of Prophecy and ChangeOrb of SoulsOrb of TimeOrb of TruthOrb of UnityOrb of Wisdompaddpulse cannonqueen parasiterefresherreplicatorsatellite DNAsensorsensor arrayserotoninsoldier parasitespawnmotherspiral wave disruptorstarbasestarshipstasis field generatorstem bolttachyontimetricorderTrill defense networkTrill historical databaseweapon scannerxenobiology

Ranks and titles

admiralambassadorassassincaptainchiefcolonelcommanderdabo girldoctorEmissary of the Prophetsfleet captaingirlfriendGrand Naguskailieutenantnursepilotprylarscience officervedek

Other references

1942Andorian languagesAP EngineeringattainderAvatar of PeaceBajoran religionbaseballbloodwinebridgecoconutcoconut piecoffeeCreoledabodayEvek ArrangementFerengi Rules of Acquisitionflight trainingGiani'aga boxGreekGrand Nagus' staffGreat Riverhunta spiderinsane asylumIrishItalianJewishjumja icekanarkar'takinkavaKorean WarlatinumLight of the ProphetsmarriagemurderNegroOccupation of BajorOhalu PropheciesPacific theaterpaghplanetpo wermreassociationReckoningroot beerrouxsand batSaurian brandyshelthrethSisko's baseballslearkStarfleet conspiracyTears of the Prophetstelepathytezhatikutube grubvacationVault of Eternal Destitutionvoleweekwhip-dodgeWorld War II


Background information

  • Unity was intended to be the first DS9 novel to be published in 2003 as part of the Tenth Anniversary of the series. After Perry became pregnant, the novel was delayed to November.
  • The book begins with a twenty page timeline laying out the events of the Deep Space Nine novels set after "What You Leave Behind" from January to August of 2376 with the book beginning in September.
  • Unity won the 2003 Psi Phi Award for Best cover and Best scene, the latter for the reunion between Sisko and Kira.
  • The German translation of the novel was released by Cross Cult in 2012. It was translated by Christian Humberg and featured new cover art by Martin Frei.

Character arcs

  • Elias Vaughn - Vaughn's relationship with Prynn deteriorates to a state as bad as before Mission: Gamma as a result of him killing Ruriko. The emotional strain results in a physical deterioration and Vaughn is forced to take some medical leave at the Shikina Monastery. In that time he has a second orb experience and meets and befriends Benjamin Sisko, the experience leaves him with a renewed determination not to lose Prynn and he takes the first steps into reforging their relationship.
  • Prynn Tenmei - Prynn's relationship with her father is at an all time low, in the meantime she pursues a romantic relationship with Shar.
  • Ezri Dax - Ezri develops somewhat guilty feelings for Dax's choice not to pursue the parasites after making first contact with them more than a century prior.
  • Ro Laren - Ro is ready to leave Deep Space 9 but after feeling appreciated for her work in the parasite crisis and with a bit of encouragement from Jean-Luc Picard she decides to stay on and become a Starfleet officer once more.
  • Shar - Shar's bondgroup returns to Andor to replace Thriss and Shar, his Zhavey makes a final request for him to return to Andor but he refuses feeling more at home on Deep Space 9 now.
  • Quark - Quark is ready to leave Deep Space 9 as the Federation's moneyless society approaches Bajor. But even his plans for new business are stopped by the Federation. Rom saves the day though initiating diplomatic relations with Bajor making Quark's the Ferengi Embassy and Quark Ambassador.
  • Taran'atar - Taran'atar still struggles to understand his purpose in the Alpha Quadrant but prevails in the will of the Founders.
  • Miles O'Brien - O'Brien feels somewhat dissatisfied as a teacher, missing the challenge but new ones dawn as Keiko takes a job on Cardassia
  • Keiko O'Brien - Keiko decides to have the family follow her career and persuades Miles to move to Cardassia to work with the I.A.A.C
  • Benjamin Sisko - Sisko returns from the Celestial Temple and joins his newly extended family turning down Admiralty in favor of a family life.


Related stories

Star Trek: Deep Space Nine relaunch publications and stories
Novels A Stitch in TimeAvatar, Book One‎Avatar, Book TwoAbyssDemons of Air and DarknessTwilightThis Gray SpiritCathedralLesser EvilRising SonThe Left Hand of Destiny, Book OneThe Left Hand of Destiny, Book TwoUnity • "Cardassia: The Lotus Flower" • "Andor: Paradigm" • "Trill: Unjoined" • "Bajor: Fragments and Omens" • "Ferenginar: Satisfaction is Not Guaranteed" • "The Dominion: Olympus Descending" • WarpathFearful SymmetryThe Soul KeyThe Never-Ending SacrificeThe MissingSacraments of FireAscendanceForce and MotionThe Long MirageEnigma TalesOriginal Sin
Miniseries and anthologies The Lives of DaxDivided We FallMission GammaWorlds of Deep Space Nine (Volume One, Two & Three)
Short stories and novellas "Horn and Ivory" • "The Officers' Club" • Lust's Latinum Lost (and Found)Rules of AccusationI, The Constable
Comics N-Vector • "Crossfire" • "No Quarter" • "All Fall Down" • "United We Stand"
Omnibuses Twist of FaithThese Haunted Seas
Related Star Trek: Section 31Star Trek: Terok NorStar Trek: DestinyStar Trek: Typhon PactStar Trek: The FallStar Trek: Coda


The novel is set in September of 2376, eight months after the final DS9 episode: "What You Leave Behind".

published order
Previous novel:
The Left Hand of Destiny
Book Two
DS9 novels
Next novel:
Worlds of Deep Space Nine: Volume One
Previous novel:
Rising Son
Novels by:
SD Perry
Next novel:
Night of the Wolves
chronological order
Previous Adventure:
Buying Time
Memory Beta Chronology Next Adventure:
Strange New Worlds 8
Always a Price
Previous Adventure:
Isolation Ward 4
Benny Russell Universe Next Adventure:
Isolation Ward 4

External links