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"Data's Day" was the 85th episode of Star Trek: The Next Generation, the 11th episode of the show's fourth season, first aired on 7 January 1991. The episode was written by Harold Apter and Ronald D. Moore, directed by Robert Wiemer.


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BaileyBeverly CrusherDataMaggie HubbellJaeJonesAlfredo JuarezFrancisca JuarezKelloggGeordi La ForgeMartinezLhian MendakKeiko O'BrienMiles O'BrienPattiJean-Luc PicardWilliam T. RikerSelok/T'PelSpotDeanna TroiV'SalWorf, son of MoghUSS Enterprise-D computer
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AureliaJohannes BrahmsArthur Conan DoyleSherlock HolmesBruce MaddoxHelena RozhenkoSergey RozhenkoUmbato

Starships and vehicles

IRW Devoras (D'deridex-class) • USS Enterprise-D (Galaxy-class) • USS Zhukov (Ambassador-class)


barbershopbridgeready roomRomulan Neutral ZonesickbayTen-Forward
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Adelphous IVengineeringGalvin VMurasaki quasar • guest quartersSt. Louis

Races and cultures

AndroidBetazoidBolianHuman (Japanese) • KlingonRomulanVulcan
Referenced only 

States and organizations

Romulan Star EmpireStarfleetUnited Federation of Planets
Referenced only 
Daystrom Institute

Other references

access codeadmiralambassadorarboretumautosequencerbearbirthdaysbonsai treecaptaincarnationcarrier wavecatchesscold feetcommandercounselorCrusher 4cyberneticsdanceday shiftdeflector dishdeflector shielddoctordress uniformfeline supplement 74first officerfluidic sensor diagnosticflutegoosehaircutHindu Festival of LightsHinduismholodeckhuman emotionsIsn't it Romantic?jazzlieutenantlieutenant commanderlogicmedicineA Midsummer Night's Dreammitochondrianight shiftNumber onePatriotismpersonal transfersphase transition coilplaypokerpromotionsrabbitred alertreplicatorribsecond schoolsecurity clearancespysubcommandertap dancetransporter padtricorderturboliftviewscreenweddingyellow alert



  • Data's comment that "Andorian marriages require groups of four people" would later form the basis of the four Andorian genders that were established in the Star Trek: Deep Space Nine novels set after the events of the television series. (Voyages of Imagination)

Related stories


published order
Previous episode:
The Loss
TNG episode produced Next episode:
The Wounded
Previous episode:
The Loss
TNG episode aired Next episode:
The Wounded
chronological order
Previous Adventure:
Flash Point
Pocket Next Adventure:
Dark Mirror


External link