Atthebeginningof2259,CaptainJohnSheridanreplacesSinclairasthemilitarygovernorofthestationHeandthecommandstafflearnthatthedeathofPresidentSantiagowasactuallyanassassinationmastermindedbyVicePresidentClarkwhoassumedthePresidencyuponSantiago'sdeathAconflictdevelopsbetweentheBabylon5commandstaffandthePsiCorps,anincreasinglyautocraticorganizationwhichoverseesandcontrolsthelivesofhumantelepathsCommanderIvanova,thesecondincommandofthestation,issecretlyalatenttelepathwhohasillicitlyavoidedregisteringwiththePsiCorps                                   　　TheShadows,anancientandextremelypowerfulracewhohaverecentlyemergedfromhibernation,arerevealedtobethecauseofavarietyofmysteriousanddisturbingevents,includingtheattackontheNarnoutpostattheendof2258CentauriAmbassadorLondoMollariunknowinglyenliststheiraidthroughhisassociationwiththemysteriousMrMordenintheongoingconflictwiththeNarnTheelderlyandailingCentauriemperor,longanadvocateofreconciliationwiththeNarn,diessuddenlywhilevisitingBabylon5Anumberofconspirators,includingLondoMollariandRefa,takecontroloftheCentaurigovernmentbyassassinatingtheiropponentsandplacingthelateemperor'sunstablenephewonthethroneTheirfirstactistostartopenaggressionagainsttheNarnAfterafullscalewarbreaksout,theCentaurieventuallyconquerNarninabrutalattackinvolvingmassdrivers,outlawedweaponsofmassdestructionTowardstheendoftheyear,theClarkadministrationbeginstoshowincreasinglytotalitariancharacteristics,clampingdownondissentandrestrictingfreedomofspeechTheVorlonsarerevealedtobethebasisoflegendsaboutangelsonvariousworlds,includingEarth,andaretheancientenemiesoftheShadowsTheyenlisttheaidofSheridanandtheBabylon5commandstaffinthestruggleagainsttheShadows