In2261,theVorlonsjointheShadowWar,buttheirtacticsbecomeaconcernforthealliancewhentheVorlonsbegindestroyingentireplanetswhichtheydeemtohavebeen"influenced"bytheShadows.DisIn2261,theVorlonsjointheShadowWar,buttheirtacticsbecomeaconcernforthealliancewhentheVorlonsbegindestroyingentireplanetswhichtheydeemtohavebeen"influenced"bytheShadows.Disturbedbythisturnofevents,Babylon5recruitsseveralotherpowerfulandancientraces(theFirstOnes)totheircause,againstboththeShadowsandtheVorlons.CaptainJohnSheridanreturnstothestationafterescapingfromZ’ha’dum,butataprice:barringillnessorinjury,hehasonly20yearslefttolive.HeisaccompaniedbyamysteriousaliennamedLorienwhoclaimstobetheoldestsentientbeinginthegalaxy.HoursbeforeSheridan’sreturn,Garibaldiisrescuedandreturnedtothestation,inratherdubiouscircumstances.HeismarkedlymoreparanoidandsuspiciousofotheralienracesandofSheridanthanhewasbefore.CentauriEmperorCartagiaforgesarelationshipwiththeShadows.LondoMollariengineerstheassassinationofCartagiaandrepudiateshisagreementwiththeShadows.LondokillsMr.MordenanddestroystheShadowvesselsbasedontheCentaurihomeworld,inanattempttosavehisplanetfromdestructionbytheVorlons.Aidedbytheotherancientraces,andseveralyoungerones,SheridanluresboththeVorlonsandtheShadowsintoanimmensebattle,duringwhichtheVorlonsandShadowsrevealthattheyhavebeenleftasguardiansoftheyoungerraces,butduetophilosophicaldifferences,endedupusingthemaspawnsintheirendlesswarsthroughouttheages.Theyoungerracesrejecttheircontinuedinterference,andtheVorlonsandShadows,alongwiththeremainingFirstOnes,agreetodepartthegalaxyforever.AftertheShadowsaredefeatedGaribaldileaveshispostassecuritychiefandworksonhisownasa"providerofinformation".HebeginsworkingforoneWilliamEdgars,aMarsTycoon,whoismarriedtoGaribaldi’sformerlove.WhileheworksevercloserwithEdgars,hebecomesincreasinglyaggressivetowardsSheridanandeventuallyleavesBabylon5.MinbarisgrippedbyabriefcivilwarbetweentheWarriorandReligiouscastes.DelennsecretlymeetswithNeroonoftheWarriorcasteandconvinceshimthatneithersidecanbeallowedtowin.Shetellshimthatshewillundergoaritualwhereinshewillbewillingtosacrificeherself,butwillstoptheritualbeforesheactuallydies.WhenNeroonseesthatsheactuallyintendstogothroughtheentireritual,herescuesherandsacrificeshimselfinstead,declaringthat,althoughhewasbornWarrior,inhisheartheisReligious.AspartoftheongoingconflictbetweenEarthandBabylon5,GaribaldieventuallybetraysSheridanandarrangeshiscaptureinordertogainEdgars’trustandlearnhisplans.GaribaldilaterlearnsthatEdgarscreatedavirusthatisdangeroustoonlytelepaths.Itisthenrevealed,thatGaribaldiwasactuallyabductedbythePsi-CorpsattheendofSeason3andre-programmedbyBestertoprovideinformationtohimattherighttime.BesterreleasesGaribaldiofhisprogramming,andallowshimtoremembereverythinghehasdonesincebeingkidnapped.Edgarsiskilledandhiswifedisappears,butisreunitedwithGaribaldiaftertheendofthewar.GaribaldihelpsfreeSheridanandreturnhimtothecampaigntofreeEarth.AnallianceledbyBabylon5freesEarthfromtotalitarianrulebyPresidentClarkinashortbutbloodywar.ThisculminatesinClark’ssuicideandtherestorationofdemocraticgovernment.Marsisgrantedfullindependence,andSheridanagreestoresignhiscommission.TheLeagueofNon-AlignedWorldsisdissolvedandreformedintotheInterstellarAlliance,withSheridanelectedasitsfirstPresidentandcontinuinghiscommandoftheRangers,whoaretoactasagalacticequivalentofUnitedNationspeacekeepers.Intheseasonfinale,theeventsof100,500,1000,andonemillionyearsintothefutureareshown,depictingBabylon5’slastinginfluencethroughouthistory.Amongsttheeventsshownarethepoliticalaftermathofthe2261civilwar,asubsequentnuclearwaronEarthinvolvinganewtotalitariangovernmentintheyearAD2762,theresultingfallofEarthintoapre-industrialsociety,thelossandrestorationofhumanity’sknowledgeofspacetravel,andthefinalevolutionofmankindintoenergybeingssimilartotheVorlons,afterwhichEarth’ssungoesnova.详情
汤姆·伯克,荷丽黛·格兰杰,娜塔莎·奥基弗,鲁斯·西恩,杰克·格林利斯,米伦·麦克,丽莎萨多维,凯特琳·伊内斯·爱德华兹,大卫·维斯特海德,克里斯蒂安·麦凯,艾玛·菲尔丁,图普·多古,詹姆斯·尼尔森-乔伊斯
塔马拉·劳伦斯,约瑟夫·戴浦西,小格什温·尤斯塔什,内斯特·亚伦·阿布塞拉
凯丽·戈德利曼,霍华德·查尔斯,弗兰西斯·巴贝,罗伯特·韦伯,伊莎贝尔·莫洛伊,索菲娅·德尔·皮佐