当Narn攻击Centauri的殖民地时，Londo和G'Kar差点发生冲突；与此同时，袭击者正在袭击空间站附近的运输船。

一艘严重受损的飞船被带进空间站，里面的奇怪外星人为灵魂猎人：一个可以感知死亡并偷走它人灵魂的不朽种族。

Londo不知不觉地爱上了一个美丽的奴隶，奴隶主想让她窃取敏感信息。Garibaldi发现有人正在使用一个受限的通信通道。

医生的一位老朋友兼前导师、异种考古学家Vance Hendricks 拜访了他，希望医生能帮助、分析他在一个异世界上发现的有机文物；但这文物似乎有自己的意愿，并开始操纵Hendricks的助手。

指挥官Sinclair的旧情人Catherine在为期一周的节日期间到来，届时人类和外星人将展示他们各自的宗教信仰；一个宿敌派了一名刺客去杀G'Kar。

心感警察到达空间站，捕捉一个变节心感成员-Ironheart心感军团教官；Catherine被G'Kar警告不要调查Sigma 957星。

一个种族主义团体在巴比伦5号上恐吓非人类。与此同时，Londo遇到Centauri星两个年轻人，他们打破传统，无视包办婚姻，为爱结婚。

Sinclair指挥官被两名男子绑架并审问，他们决心证明他在前线战役中与外星人勾结背叛了地球，但却使指挥官恢复了脑中缺失的记忆。

Na'Toth攻击了一名刚到空间站的外星女子，声称她就是Dilgar战犯Jha’dur，也称夺命者。与此同时，心灵感应师Talia被Kosh雇佣来监督一个相当奇怪的谈判。

一对外星夫妇带着病入膏肓的儿子来找医生治疗，这个孩子可以通过简单的手术治愈，但父母的宗教信仰不允许手术。与此同时，Ivanova护送一艘受损的星际船穿过突袭者的领地。

就在总统访问巴比伦5号的前几天，空间站一码头发生了爆炸。一个受伤垂死的男人牵连到Garibaldi，这正是总统安全负责人想要听到的，因为她把父亲的死归咎于Garibaldi。

在停靠舱发生事故后，空间站的码头工人举行了游行罢工。G'Kar试图参加Narn的宗教仪式，但必须找到在事故中被毁的G'Quan-Eth花的替代品。

一位Centauri贵族来到巴比伦5号，欲将Londo购买的一件重要遗迹运回国内。一神秘男子Morden拜访了所有的外星大使，向他们提出了一个不同寻常的问题。

Garibaldi一位老朋友来到巴比伦5号，参加在“Mutai”一个野蛮的外星战斗竞技场中竞技。与此同时，Ivanova在处理父亲的死亡时遇到了麻烦。

一名男子来到巴比伦5号，向外星大使询问可以帮助他寻找圣杯的信息，而一名地下黑帮则通过杀掉所有反对他的人来解决走私问题。

地球督查组和心感团军事专家抵达巴比伦5号，检测空间站指挥阶层对地球的忠诚度。Lennier对Garibaldi组装1990年代摩托车表现出极大的兴趣。

一艘Minbari巡戈战舰来到巴比伦5号，展示一位最近去世的Minbari战将的遗体，而 Ivanova和Talia则为一位拥有心灵感应能力的年轻女孩的命运而战。

奇怪的信号来自巴比伦5号下方的行星Epsilon 3。一艘科学船被派去调查，但遭到了星球上防御系统的还击。与此同时，Garibaldi 担心他在发生内战中火星上的情人。

当地球联盟的一艘重型巡戈舰抵达空间站，以“保护地球利益”，局势加剧，Epsilon 3号上的聚变反应堆开始失控，并可能炸毁星球和空间站。

巴比伦4号在四年前消失的地方再次出现，Sinclair和Garibaldi率领探险队疏散船员。与此同时，Delenn被灰色委员会任命为新的领袖。

医生在空间站穷人区调查一名未经许可的行医者，而Londo则带着Lennier参观了巴比伦5号的地下红灯区。在禁闭室里，一名被定罪的杀人犯等待着他的判决——人格死刑。

Quadrant 37星前哨战遭突袭，Narn损失惨重，G'Kar离开空间站前去调查。与此同时，Garibaldi试图找出他线人死亡原因时遭到暗算；地球联邦总统Luis Santiago遇袭身亡；Delenn化蛹进行转变；巴比伦5号在十字路口...

谢里登来到巴比伦5号，取代辛克莱，并处理一艘叛变的米巴里巡洋舰。

谢里登的妹妹来拜访他在新指挥部的他，G'Kar带着来自已知空间边缘的严重消息返回，弗兰克林博士试图用从罗森博士那里获得的外星治疗设备唤醒格里巴尔迪，而且德琳的房间里正在发生一些事情。

一个被称为“技术法师”的神秘团体在巴比伦5号暂时居住，隆多非常渴望与他们见面。与此同时，德拉齐人用他们相当不寻常的选举过程给新晋升的指挥官伊凡诺娃造成了问题。

一艘巨大的探险级船舶来到巴比伦5号补给——船长是谢里登的老朋友。当弗兰克林博士开始分发“食物计划”时，他激怒了指挥部的其他成员。

一艘有100年历史的太空探索船出现在巴比伦5号附近，上面有两名乘客：一个在低温睡眠中的女人，她丈夫的尸体，以及一个与半疯的潜伏者有未了的恶意事物。

塔莉娅的一个朋友来到巴比伦5号，谈判一项协议以帮助火星变得更加自给自足，当一个男人喊着“自由火星！”电死他时。

隆多召集他的三个妻子到巴比伦5号，这样他可以和其中两个离婚，塔莉娅接待了她讨厌的前夫——唯一一个离开PSI军团的男人，德琳经历了她的第一个糟糕的头发日。

贝斯特返回巴比伦5号，关闭一个地下组织，该组织将逃亡的心灵感应者偷运出PSI军团的触手。同时，谢里登与地球力量就他的住宿费用发生了一些分歧。

衰老的半人马座皇帝不顾健康状况恶化，仍前往巴比伦5号。雷法看到这是一个机会，让隆多公开羞辱皇帝，同时G'Kar准备刺杀他。

当25,000名地球力量士兵到达时，巴比伦5号出现了相当大的空间问题。他们由理查德·弗兰克林将军领导，斯蒂芬·弗兰克林的父亲，他们将使用巴比伦5号作为一个冒险军事行动的起点。

谢里登领导一支星怒战斗机中队调查几艘船只的失踪，他被一艘外星船只捕获。与此同时，德琳被召唤到灰色议会，讨论她最近外貌的变化。

G'Kar努力控制巴比伦5号上的纳恩人，他请求不同的大使帮助对抗半人马座的战争。伊凡诺娃向一个新物种的代表展示空间站，这样他可以决定人类是否值得他们存在。

总统的医生逃到巴比伦5号，躲避地球力量特工的追捕。他们说他有计划卖给外星政府的机密信息，但谢里登很快就了解到了其他情况。

谢里登被米巴里的洛维尔袭击，并被迫自卫杀死他。但是，一个目击了这一事件的米巴里声称谢里登先发制人，并且大家都知道米巴里不会撒谎。

我们通过ISN的眼着看巴比伦5号的生活，辅以采访、统计数据，甚至一些商业广告。

谢里登震惊地得知，伊卡洛斯号上的船员之一——即他妻子所在的科学船发生爆炸而死——居然还活着，那就是莫登先生。和平部的一名代表来到空间站，招募人员加入夜间警戒。

隆多接待了一个老朋友，他在被中央议会称为叛徒后寻求他的帮助。谢里登在被一个死去的外星人攻击后开始产生幻觉。

一种100%致命且100%传染的瘟疫正在杀死马卡布人。弗兰克林博士试图找到治愈方法，但马卡布人自己反对他，他们相信瘟疫只影响不道德的人。

莱塔·亚历山大带着心灵感应者抵抗组织的消息返回巴比伦5号：指挥部的某个成员是PSI军团的内鬼。

德拉尔向谢里登显现自己，同时雷法和隆多启动了一个计划，将导致纳恩人的最终失败。

科什召唤一个审问者来测试德琳的动机，G'Kar试图在组织地下抵抗的同时保持他作为巴比伦5号纳恩人口群的领导者地位。

和平部的两名官员来到巴比伦5号；一个处理半人马座持续扩张的问题，另一个检查当地的夜间警戒。同时，一艘纳恩重型巡洋舰寻求庇护，以便他们进行维修，而凯弗继续寻找证明阴影船只存在的证据。

An Earth Force investigator comes to Babylon 5 with Lt. Keffer's last recording, asking the ambassadors if they recognize the ship in it. Meanwhile, Londo takes steps to remove himself from the Shadows, and Sheridan takes the White Star out for its first mission.

A bomber is loose on Babylon 5; setting of bombs with seemingly no pattern. G'Kar blames the Centauri, Londo blames the Narn - and in it all, Lennier is critically injured. At the same time, a group of monks request permission to live on the station.

The new Centauri appointed Narn government send a replacement for G'Kar, while an alien probe threatens to destroy Babylon 5 unless it gets the answers for a series of complicated scientific questions.

One of the monks starts having disturbing visions and realizes that his past may not be how he remembers it. Meanwhile, Lyta causes a bit of commotion when she returns from the Vorlon homeworld.

Delenn decides it's time to try to contact some of the first ones and enlists the help of Draal, while Babylon 5 is assigned a political officer.

Bester comes to the station to track down a dealer of Dust - an illegal drug that gives normal people temporary telepathic powers. G'Kar is also interested in the drug. He sees it as a potential weapon against the Centauri, but first he has to test it.

Marcus starts snooping around Downbelow when some of his contacts start behaving unusually and a lurker is found dead with a strange creature bonded to his spine. Ivanova investigates Corwin's loyalties when he receives a promotion.

An archaeologist arrives at Babylon 5 with a grave massage: a dormant Shadow ship has been found on Ganymede. It must be destroyed before it falls into the hands of President Clark.

Clark has just declared martial law, and while Nightwatch prepare to take control of the station, Zack has to decide whose side he's on. In an exercise of bad timing, the prophetic widow of emperor Turhan finally comes to the station, granting Londo the visit he's been begging her for, for a long time.

The renegade destroyer "Alexander" arrives at Babylon 5 and Sheridan is forced to announce the station's secession from the Earth Alliance, and prepare for an attack by Clark's forces. Meanwhile, Delenn is forced to go to Minbar when the Grey Council refuses to act upon increased Shadow activity.

Delenn prepares for a ceremony of rebirth, the station's computer goes through an interesting change, Londo "encourages" Refa to stop associating with the Shadows, and the remains of the Nightwatch on Babylon 5 plan to strike at Sheridan through Delenn.

Vir returns to Babylon 5 to find that he now has a wife and that two Narns are out for his blood. Meanwhile, Ivanova investigates the activities of the mysterious Centauri Abrahamo Linconi.

A mysterious man comes to Babylon 5 dressed in chainmail and armed with a sword. His name? King Arthur - Son of Uther Pendragon, come to help when he is needed most.

Bester comes to Babylon 5, this time seeking help against a common enemy - the Shadows. Meanwhile, G'Kar demands to be included in the War Council.

Morden returns to secure Londo's cooperation again, Garibaldi confronts Franklin about the stims, and Kosh gives Sheridan a victory against the Shadows - but at a price.

Ivanova gets a distress call from herself pleading for help as the Shadows destroy Babylon 5. It is dated eight days into the future. At the same time, on Minbar, Sinclair is given a nine-hundred-year-old letter from Valen, telling him that a drastic action must be taken to prevent that future.

While Sheridan is unstuck in time, seeing a glimpse of a future Centauri Prime in ruins, the others continue with their plan to take Babylon 4 back in time.

The new Vorlon ambassador arrives, Sheridan decides it's time to test just how effective telepaths are against the Shadow ships, and Franklin is on walkabout in Downbelow and falls in love with a singer.

Garibaldi investigates an area where a maintenance worker disappeared and finds a whole floor that was forgotten after construction, including its rather strange inhabitants. Meanwhile, Delenn is about to take on the role of Ranger One, but Neroon swears to stop her.

Londo forces Vir to participate in a plan to kill G'Kar. Sheridan struggles with figuring out the Shadows' tactics.

With the Shadows next target known, a massive counterattack is prepared. Ivanova and Marcus scout ahead in the White Star, while the fleet stands by in hyperspace. At the same time, Franklin finally has to face his problems as he lies fatally wounded in Downbelow.

After he has recovered from the shock of seeing her, Anna gives Sheridan an ultimatum - come to Z'ha'dum with her, or never know what happened to her there.

In the aftermath of the explosion on Z'ha'dum, Sheridan is presumed dead and Garibaldi is missing. Delenn struggles to keep the alliance against the Shadows together, and Londo takes up his new position on Centauri Prime as security advisor to the emperor.

On Z'ha'dum, Sheridan floats somewhere between life and death. Meanwhile, G'Kar risks imprisonment to try to find Garibaldi.

Ivanova and Marcus take a White Star out to search for more first ones to aid in the war, while Londo tries to convince G'Kar to swallow his pride so Cartagia will find him entertaining. A mysterious spacecraft makes its way towards Babylon 5.

With the Vorlons destroying whole worlds, Babylon 5 is struggling to cope with the refugees. And with one Vorlon aboard, they cannot make a move without them knowing about it, so Sheridan decides to kill him. On Centauri Prime, Cartagia explains to Londo how he will become a god when the Vorlons destroy the planet.

As reports that the Shadows are destroying planets too start to come in, Sheridan prepares for one final showdown with the Shadows and the Vorlons. Meanwhile on Narn, Londo makes everything ready - G'Kar's chains have been weakened and an undetectable weapon has been acquired. Tonight Cartagia must die.

In the hours before the Shadows and the Vorlons meet Sheridan's alliance at Corriana 6, Ivanova and Lorien search the last of the First Ones, and Londo races back to Centauri Prime in hope of removing all Shadow influence before the Vorlon planetkiller arrives.

Bester comes to Babylon 5 with information about President Clark's plans to discredit the station. But it has a price tag attached - he wants them to go to Z'ha'dum to look for any leftover technology that might help revive his lover. Garibaldi resigns his position as security chief.

A team of ISN reporters arrives at the station wanting to do a story about Babylon 5. Sheridan refuses at first, but finally agrees on the theory that at least a small part of their side of the conflict will be shown.

When her clan has doubts about her reason for taking Sheridan as a mate, Delenn is required to go to Minbar to attend "the Dreaming". Sheridan sends Marcus and Franklin to Mars to make contact with the resistance there.

Marcus and Franklin meet their liaison to the Mars resistance, but are greeted at gunpoint by the resistance itself. Meanwhile, Sheridan confronts Garibaldi about his attitude.

Delenn investigates attacks on ships of races allied with the Minbari, and encounters the Drakh for the first time. On Mars, Franklin rallies the resistance leaders to Sheridan's cause.

Garibaldi gets his first assignment from his new employer - helping someone getting on and off the station without having to pass through customs. He is quite surprised at who this person is. Meanwhile, Ivanova makes preparations for the first broadcast of "The Voice of the Resistance".

Sheridan hatches an eccentric plan to convince the League to accept White Star patrols on their borders, while Delenn seeks help from Neroon to end the civil war that has broken out on Minbar.

The warrior caste has surrounded the religious caste's stand in the capital city on Minbar, and demand they surrender or be destroyed. Meanwhile, Bester makes Lyta an offer for her body.

With Clark having killed 10,000 unarmed refugees, Sheridan once again mobilizes for war. The first target is Proxima 3, which is being bombed into submission. At the same time, Londo tries to get G'Kar to partake in a joint Centauri-Narn statement in support of the war against Clark.

As Sheridan's forces continue towards Earth, Garibaldi is finally allowed to meet his employer, William Edgars, face to face on Mars, and is after telepath assisted interrogation finally told what he must do to gain Edgars' complete trust. Meanwhile, Dr. Franklin discovers that Lyta can influence the Shadow modified telepaths.

After arranging for the arrest of Sheridan's father, Garibaldi gives his former commander the news, and urges him to come to Mars to arrange a rescue operation. But Garibaldi drugs Sheridan as soon as he gets there, and hands him over to Clark's forces. Finally, Edgars reveals his plans to Garibaldi.

In a bleak room, an interrogator tries to force Sheridan to admit he was under alien influence and worked to undermine Earth.

Garibaldi is barely able to convince Lyta and Franklin that his recent behavior was caused by Bester, and they organize a rescue for Sheridan. Meanwhile, Ivanova gets word that a trap has been set at the fleet's next rendezvous point by a group of completely new advanced-technology destroyers.

The only obstacle remaining between Sheridan and Earth is a fleet near Mars. With the help of the resistance, Sheridan plans to smuggle Shadow modified telepaths onto the fleet, hopefully disabling it long enough for him to take Earth. Meanwhile, Marcus is determined to find a way to help Ivanova.

Clark is dead and the civil war over, but several issues are unresolved. Ivanova is grief-struck at Marcus death and Lise is missing, and Sheridan must now face the consequences of his actions. He did the right thing - but in the inconvenient way.

Far into the future, someone is archiving video clips pertaining to the fate of Earth and the Interstellar Alliance.