主演：Bruce Boxleitner Michael O'Hare Claudia Christian Jerry Doyle Mira Furlan Richard Biggs Andrea Thompson Bill Mumy Jason Carter Tracy Scoggins Stephen Furst Patricia Tallman Peter Jurasik Andreas Katsulas Jeff Conaway Robert Rusler
Atthebeginningof2259,CaptainJohnSheridanreplacesSinclairasthemilitarygovernorofthestation.HeandthecommandstafflearnthatthedeathofPresidentSantiagowasactuallyanassassinationmastermindedbyVicePresidentClark(whoassumedthePresidencyuponSantiago'sdeath).AconflictdevelopsbetweentheBabylon5commandstaffandthePsiCorps,anincreasinglyautocraticorganizationwhichoverseesandcontrolsthelivesofhumantelepaths.CommanderIvanova,thesecond-in-commandofthestation,issecretlyalatenttelepathwhohasillicitlyavoidedregisteringwiththePsiCorps.
TheShadows,anancientandextremelypowerfulracewhohaverecentlyemergedfromhibernation,arerevealedtobethecauseofavarietyofmysteriousanddisturbingevents,includingtheattackontheNarnoutpostattheendof2258.CentauriAmbassadorLondoMollariunknowinglyenliststheiraidthroughhisassociationwiththemysteriousMr.MordenintheongoingconflictwiththeNarn.TheelderlyandailingCentauriemperor,longanadvocateofreconciliationwiththeNarn,diessuddenlywhilevisitingBabylon5.Anumberofconspirators,includingLondoMollariandRefa,takecontroloftheCentaurigovernmentbyassassinatingtheiropponentsandplacingthelateemperor'sunstablenephewonthethrone.TheirfirstactistostartopenaggressionagainsttheNarn.Afterafull-scalewarbreaksout,theCentaurieventuallyconquerNarninabrutalattackinvolvingmassdrivers,outlawedweaponsofmassdestruction.Towardstheendoftheyear,theClarkadministrationbeginstoshowincreasinglytotalitariancharacteristics,clampingdownondissentandrestrictingfreedomofspeech.TheVorlonsarerevealedtobethebasisoflegendsaboutangelsonvariousworlds,includingEarth,andaretheancientenemiesoftheShadows.TheyenlisttheaidofSheridanandtheBabylon5commandstaffinthestruggleagainsttheShadows.
