The USS Mendel was a Federation Constitution-class science vessel starship in Starfleet service in the mid-23rd century. (ST video game: Trexels)


At some point between 2265 and 2270, the Mendel was dispatched by Starfleet to the unexplored Trexelian Expanse. The Mendel's captain send a distress call which was received by Starfleet. Admiral Sahkalin ordered the USS Trexelprise, which was also on a mission of exploration in the expanse, to investigate. The Trexelprise found the Mendel on the outer rim of the Koloran Nebula in Trexelian Sector 002. After several hailing attempts went unanswered, the Trexelprise's captain led a landing party to the Mendel. They found the Mendel's crew under alien influence or infected, which turned the crew aggressive. The infection began to spread to the Trexelprise before its chief medical officer and scientists were able to cure the affliction. The two Constitution-class ships subsequently joined forced to investigate the origin of the infection. (ST video game: Trexels)



Early series of Constitution-class class I/class XI heavy cruiser starships
Federation, Starfleet built to mk I specifications ConstellationConstitutionDefiantEndeavorEnterpriseExcaliburExeterFarragutHoodIntrepidKongoLexingtonPotemkinRepublicValiant (I)Yorktown Ufp-emblem Starfleet Command logo
various specifications AlexanderAsimovBraheConfederateEnterprise (Vardaine copy)Excalibur IIGloryIndomitableIsshasshteReuben JamesJeffersonJohn F. KennedyMendelNautilusOlympus MonsOrtiseiPathfinderSurakTao FengTrexelpriseTrojanVentureZimbabwe

see also: unnamed Constitution-class starshipsExeter-subclass: Exeter-CKirkExcalibur-subclass: ExcaliburTuckerVesper-subclass: VesperMontrealOakland

Terran Empire, Starfleet
(mirror universe)
ConstitutionCarnageConstellationBansheeDefiantEnterpriseExcalibur (23rd century)Excalibur (Excalibur-subclass)ExeterHoodKodosLexingtonNobunagaPotemkin TerranEmpire
23rd century subclasses: Bonhomme Richard-subclass (mk II) • Achernar-subclass (mk III) • Tikopai-subclass (mk IV) • Enterprise-subclasses (mk I-III refits)

24th and 25th century subclasses: Excalibur-subclassExeter-subclassVesper-subclass • other Constitution variants

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