ThePsiCorpsandPresidentClark,whosegovernmenthasdiscoveredShadowvesselsburiedinEarth'ssolarsystem,begintoharnessthevessels'advancedtechnology.TheClarkadministrationcontinuestobecomeincreasinglyxenophobicandtotalitarian,andusesamilitaryincidentasanexcusetodeclaremartiallaw.ThistriggersawarofindependenceonMars,whichhadlonghadastrainedpoliticalrelationshipwithEarth.Babylon5alsodeclaresindependencefromEarth,alongwithseveralotheroutlyingEarthAlliancecolonies.Inresponse,theEarthAllianceattemptstoretakeBabylon5byforce,butwiththeaidoftheMinbari,whohavealliedwiththestationagainstthegrowingShadowthreat,theattackisrepelled.  ccc
BecomingconcernedovertheShadows'growinginfluenceamongsthispeople,CentauriambassadorLondoMollariattemptstosevertieswiththem.Mr.Morden,theShadows'humanrepresentative,trickshimintorestoringthepartnershipbyengineeringthemurderofMollari'smistresswhileputtingtheblameonarivalCentauriHouse.OpenwarfarebreaksoutbetweentheShadowsandtheallianceledbyBabylon5andtheMinbari.ItislearnedthatgeneticmanipulationbytheVorlonsisthesourceofhumantelepathy,asitislaterdiscoveredthatShadowshipsarevulnerabletotelepathicattacks.DispleasedattheVorlons'lackofdirectactionagainsttheShadows,CaptainJohnSheridanbrowbeatsVorlonambassadorKoshNaranekintolaunchinganattackagainsttheirmutualenemy.Kosh'sdeedsleadtohissubsequentassassinationbytheShadows.
FormerstationcommanderJeffreySinclairreturnstoBabylon5toenlisttheaidofCaptainSheridan,Delenn,IvanovaandMarcusinstealingtheBabylon4spacestationandsendingit1,000yearsbackintimetouseitasabaseofoperationsagainsttheShadowsinthepreviousMinbari-Shadowwar.UndergoingthesametransformationasDelennattheendofSeason1,SinclairtransformsintoaMinbariandissubsequentlyrevealedtobetheactualValenofMinbarilegend,ratherthanareincarnation.Spurredbythereappearanceofhisassumed-deadwife(whonowworksfortheShadows),SheridantravelstoZ'ha'dum,theShadowhomeworld,inanattemptbythemtorecruithim.Howeverheinsteaddestroystheirlargestcityinakamikazenuclearattack,andislastseenjumpingintoamiles-deeppittoescapetheexplosion.Garibaldi,duringafightwithShadowvessels,goesmissing.
内尔·德贞,尼克·亨德里克斯,菲奥娜·多尔曼,安妮特·白兰特,安伯·阿迦,迈克尔·伯恩,Beth Cooke,约翰·康明斯,Zebb Dempster,安吉拉·格里芬,托尼·加德纳,Anita Harris,杰森·梅雷尔斯,安佳丽·莫辛德拉,Chu Omambala,伊莲·佩姬,马诺伊·阿南德,迈克尔·海登,乔·惠特利
内尔·德贞,尼克·亨德里克斯,菲奥娜·多尔曼
内尔·德贞,格威利姆·李,菲奥娜·多尔曼,曼金德·维尔克,海伦·巴克森代尔,阿拉斯泰尔·麦肯齐
内尔·德贞,格威利姆·李,菲奥娜·多尔曼,塔姆金·莫莉森,詹姆斯·莫瑞,汉娜·托茵东
内尔·德贞,格威利姆·李,菲奥娜·多尔曼,塔姆金·莫莉森,尤娜·斯塔布斯,乔治娅·泰勒
内尔·德贞,尼克·亨德里克斯,菲奥娜·多尔曼,安妮特·白兰特