Trenjan was a 23rd century Human man who served in Starfleet and was assigned to the Federation starship USS Enterprise in 2285. In that year, Trenjan was a lieutenant, one of about a half-dozen crew replacements that joined the Enterprise at Starbase 19.

When the replacements beamed aboard, Scotty introduced himself, as he had put Trenjan on the task of courier in bringing aboard two fifths of a specialty alcohol. (TOS comic: "Who Is... Enigma?")

USS Enterprise (NCC-1701) miscellaneous personnel
original configuration crew (2240s-2260s) AdamskiAgbaduduM. AlexanderAlfordAlnasAndersonArbeeBartholomewBatesBeaumontBellBrennerBrettonBriggsCalderCarterCastanuelaChangChaseChenChestertonClaireCordellCrandallDeanDemickDentonDickEckertEllisFerriterForbesFosterFritzFroodGabrielGarveyHornickHoskinsHuntHurchallaIxJacksonU. JacksonJakorskiJeffreysJinzJohnsonJordanKarrasKentT. KimkingcomeKlecknerKukarKulessaLarayaLancerLaneLivingerLoiMakowskiMancusoMargolisMartinMatsonMaudieMcNairMedinaM'GuraMichalukM'turrMoodyPaynePiperPoolRaegerReismanReyesRosenSardaSawchukSellersShawShumSikhB. SmithH. SmithSmithySneadSolinskiEric StaaltenburgSteinTanakaTaylorJ. TaylorThomkinsTi-ChenT'KhulnTomlinsonTrawleyUyloanVuongWagnerWashingtonWebbWilliamsYangYork Starfleet emblem. USS Enterprise assignment insignia.
refit configuration crew (2270s-2280s) AbernathyAhrensAledortAustinBearclawBischoffBrandBrassardCanfieldClaremontCoffeyCroyDeckertDennehyEisenbergFederFosterIbsenJacobsKellyKhalifaKonomKorrenTran Van KyLangsamLihwaLittLondonDiane MaassDonald MaassMalksonMatheeMeierMiñambrésMorrisMullerOranjeboomRemnerRogersRotslerSaavikTrenjanWelkinZaandZh'Ral UFP emblem. USS Enterprise assignment insignia.
see also: administrative personnelcommunications personnelengineering personnelmedical personnelpilots & flight control personnelsecurity & tactical personnelsciences personnelsenior staff • unnamed (2240s and 2250s2260s2270s and 2280s)
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