Algenib II was the second planet in the Algenib, or Alpha Persei system.

It was first charted by Earth Starfleet starship Columbia in 2159, at which time it was observed to be a lifeless world similar to Mercury. In the late 2260s, the USS Enterprise approached within 20 light-years of Algenib II, at which time it appeared to be Class M. Enterprise Captain James T. Kirk assigned Lieutenant Thorvald Pearson, head of stellar cartography, to take a shuttle to the planet to investigate. The shuttle crashed mysteriously, forcing Kirk, along with Spock and McCoy, to beam down and retrieve the missing crewmembers. (TOS short story: "Make-Believe")

The USS Enterprise-E completed a mission to Algenib II in mid-2372. (TNG - Slings and Arrows eBook: The Insolence of Office)

planets visited by the USS Enterprise (NCC-1701) during Captain Kirk's initial five-year mission (2265-2270)
various Aprilia IIICaporyGarrusTriangularis III
2265 EarthDraxis IITallyGamma Alpha VPollux IIStarbase 8 planetSector Vega 6 planetM-155Archernar IVDimorusMandylion VTendar IVMestikoAlpha Ortelina VIIArronus VIIAldebaran IIIDelta Vega IStarbase 12VelluriusEarthEmpyreaGlobular planetNorusJunkyard planetPalnak's planetSantarNova XIIIZeltokKorakTraveler's homeworldDukarNeesanAlgenib II
2266 Crucial-3VultraRobots' planetAngomaMantis planetNuofoStaiVrexBalant planetZargotColtacRigel XIIAlfa 177M-113Psi 2000Tlaoli IVSkurSelkyeTaragonAlpha 332Ynobe IIEcnalRayloNorigaAlpha Proxima IIArgylusOminnusEarthK-GSeggorForniaAngiraBeta IINeesanKujalLunaBwujaFayoHerculaEarthKibo/NdoraNrakaAlpha 23-COordonMobitaJodarrQuodarZartaFloe IMetamorphaInicrustMortiTerrellian IIVoodoo planetRiza homeworldMila XaKrugar III remnantQuaraxusArimaMazdaNumero UnoBeta CarinaeExo III1324-IV7348-IITantalus VMiri's homeworldPlanet QBenecia
2267 Taurus IIMakus IIIXimega IIHydra Epsilon IIIPerseus Arm planetoidYkoTenkaraSalvumGrotusVaranu planetYkoTalos IVTektonRifas-LAmusement Park planetHeitius VIICentaurus VFomalhaut VTyrtaeus IIGothosBeta VITheta VIIRamedes IIICestus IIIAlvaLazarus's planetGalaxy Zekbran planetCygnet XIVEarthCanaraBeta IIIDraqqanaEminiar VIICeti Alpha VGamma 400VartaxDak-AlphaTimshelOmicron Ceti IIIJanus VI7348-IIChandra IVOrganiaAngrenaYkoEarth Colony IIGatewayEarthDenevaJanvarZentarZettin • "the Frontier" • ModalaGamma XaridianElsinor H-25Starbase 10Beta Mariotia IIIVega IIITondusVarkan asteroidTekkorCarnakPyris VIIEarthPentam VGamma Canaris NVandros VIINukoleeStyraLurotaGiant Brain asteroidOtari IIGatewayIsis IIINot EdenMaaba S'JaCapella IVPollux IVVulcanMestikoNadorTactis IIBeta Nirobi IIPhygma IVOutpost Omega-70Tau Gamma IVM-370Argelius IIMerope IVMalurEulusDonico IIGamma Trianguli VIMasabaLekythosTyrtaeus IIShroud IVHalkaIxtoldeGamma Hydra IVCalydonBelmara IVTuran Tot Narut's planetGamma Canaris NTaunusPlanet 656Beton IIIKwettirSklurrKarrGraktanTharkMorkolPlixesAndriusMuddEarthAneher IIWezonvuNalaingMagna RomaBavaryaNeolithiaMythraRimilliaBabelGamma Canaris NTNC 65813VulcanNisusCertaxNarnel's WorldNGC 667Neural
2268 Fornax IIGamma IITriskelionRudimonArgus XTycho IVCentaurusUsildeTheta VIISigni BetaTautee systemVulcanBeta Canzandia IIIMevinnaSigma Iotia IIXanviaXoxxaInquisitor's planetBeta ReticuliDelta VegaNalogen IVDelta VegaDelta Canaris IVAlnath IIAmmdonArretEkosEeiauoSivaoKahlessOmega IVEarthTheta Kiokis IIElasTroyiusElethiaAlsandKosTau Delta IXAmerindStarbase 14 planetAndru 4/6Tranquility VIIMinos VEarthExo IIIT'nufoMinos VEando 375Wrigley's Pleasure PlanetExo IIITortuga VITaos IVTriacusMarcos XIIWokkle IIICawley IVMakon IIIKalaLowariaDreamers' planetSigma Draconis VIDireidiMedusaElcidar Beta IIIMinara IIOctavius IVBeta CabriniPegasus IVCareta VBeta XII-APlatoniusIzellEarthScalosM-317Beta Aurigae IIISanoora host planetRhinegeltKalandan outpostBrellian IVPrastorDistrelTttnicktttnorAriannusCheronElba IISanctuaryGideonKolya
2269 Memory AlphaMerak IIArdanaPollux VAvalonBalkos IIINova Atar IIIVesbiusJanus VIPollux IILeora IVWaasertlaMygdalus IIICentaurusRaga's PlanetEdenTheta Tau VHolberg 917GBeta Niobe IIIExcalbiaSarpeidonCamus IIDuwamishEphrata IVSigma Niobe IIGatewayKrasniMaltos IVOrganiaKyrosBeta CastelliNestaAnomalyAcademyArachnaeLyraBabelEpsilon Delta IVHeartlandMemory PrimeTalin IVSyhaar PrimeGatewayMantillesTaurus IIBeta Omicron Delta IIIMotherlodeMegas-TuTerratinSherman's PlanetThe StrandAarak IIIPhi XIUr homeworldVidenDengella IIEphrata IVGobi IIIPacificaGralafiLoren VArgoWaycrossPerryDelta Gamma IVDetente ITrefolgTrellisaneBeta CastelliHeloxBoaco VIJuram VVancadiaChyrellkaVeletus VPatria IPelos
2270 Janus VIPhylos IIVedala asteroidDramiaDramia IIArretLactra VIIBoqu IINGC 7332Delta Theta IIIPandroBriamosBelarius IVVelat Nol/R-836 IIGelladorn/R-775 ILotora IIICenotaphVehtora IVN'caiMuldoonCoridan IIIAkladiMuddKubanSaraiStarbase 7 planetStella Mudd's planetMuddTaygeta VOkeanosBeta Omicron Delta IIIYoondriGatewayZeta GibraltarAndrosYusubEarth (alternate)SycoraxBira IIINjuraOmne's planetVoranRazarMercanAleriadAritaniYalboVulcanUnnamed Hoshan planetsTanisAragosAleph PrimeAleph IIIAntos IVTakoi homeworldEarthDenebiaVeneu IIKlondike VIIsitra ZeroPelosArchernar IVTalos IVPillagra/R-855EarthStarbase 12Tomarii
planets visited by the USS Enterprise (NCC-1701-E)
EarthElamin IXAlgenib IISalva IVChiaros IVKendarayDenobulaGalor IVGornarBetazedRaknal VBa'kuHalkaPrimus IVGemworldTaDBlossom IVTerra GalanBajorNarendra IIIPelleus VSolosos IIIDavlos VICygnet IVMyrmidonTezwaKolarus IIIRomulusTolochon IIDokalaan homeworldDokaalan colonyCarreaDelta Sigma IVGorsach IXTrophy WorldRamatis IIIFromander IVVulcan
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