In the mirror universe, the Capital Gain was a warship constructed by the Terran Rebellion based on the Starfleet Defiant-class starships from the primary universe.

After the Terran Rebellion built their own version of the Defiant in 2372, Generals Julian Bashir and Zek turned the abandoned Klingon-Cardassian Alliance space station Empok Nor into a shipyard capable of producing up to twelve Defiant-class starships at once. The Capital Gain was the first of them to be completed and was placed under Zek's command.

Like the rest of the Defiant-class warships, the Capital Gain was equipped with a Romulan cloaking device. After Empok Nor and the other Defiant-class ships were destroyed by the IKS Ya'Vang, the Capital Gain was captured and its cloaking device fell into the hands of the Alliance. (DS9 - Mirror Universe novel: Saturn's Children)

Defiant-class destroyer/escort starships
Federation Starfleet
(primary universe)
standard arrangement AjaxAlaskaAlbatrossAldebaranAlexey LeonovArmstrongArk RoyalAvengerBaracusBarracudaBaton RougeBelfastBenningtonBoxerChampionCheyenneCobraConcordCondorCormirCorvusCrockettDauntlessDefiant (I)Defiant (II)Defiant-CEagleEclipseFalkirkFargoFormidableFranklinGallantGalahadGauntletGawainGrantHalberdHavocHelenaHorizonHornetHurricaneIllustriousIncessantIwo JimaJavelinKantKingfisherLawLeeLeyteLoganLokiMan-o-WarMatadorMayaMedvedevMerrimackMichiganMongooseMonitor (I)Monitor (II)MonsoonMorganaMoscowMyrmidonNarcissusNeptuneNomadPendragonPleiadesPotemkinPythonQuillonRamsesRangerRavenRedoubtableRelentlessRenegadeRevereRockfordRomeSaladinSao Paulo (I)Sao Paulo (II)SavannahScorpionSiouxSiroccoSnake EyesSpitfireStalwartStrommingTenaciousThorTiconderogaTitanTreplevTriumphTritonTsunamiTurinValiant (I)Valiant (II)ValorousVanyaVictoriaVictoriousVigilantVoltaireWarspiteWaspWolverineZeppelin UFP emblem image. Seal of the Federation Starfleet.
other configurations Incursion-subclass: IncursionGallant-subclass: GallantVigilant-subclass: VigilantSao Paulo-subclass: IndefatigableNikeQuantumSao Paulo (II)
mirror universe Terran Rebellion Capital GainDefiantJadziaTerra Victor Seal of the Terrans.
Terran Empire DefiantQuantum Seal of the Terrans.
Species 8472 Poseidon Seal of the Undine.
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