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　　In 2261, the Vorlons join the Shadow War, but their tactics become a concern for the alliance when the Vorlons begin destroying entire planets which they deem to have been "influenced" by the Shadows. Disturbed by this turn of events, Babylon 5 recruits several other powerful and ancient races (the First Ones) to their cause, against both the Shadows and the Vorlons. Captain John Sheridan returns to the station after escaping from Z'ha'dum, but at a price: barring illness or injury, he has only 20 years left to live. He is accompanied by a mysterious alien named Lorien who claims to be the oldest sentient being in the galaxy.
　　Hours before Sheridan's return, Garibaldi is rescued and returned to the station, in rather dubious circumstances. He is markedly more paranoid and suspicious of other alien races and of Sheridan than he was before.
　　Centauri Emperor Cartagia forges a relationship with the Shadows. Londo Mollari engineers the assassination of Cartagia and repudiates his agreement with the Shadows. Londo kills Mr. Morden and destroys the Shadow vessels based on the Centauri homeworld, in an attempt to save his planet from destruction by the Vorlons. Aided by the other ancient races, and several younger ones, Sheridan lures both the Vorlons and the Shadows into an immense battle, during which the Vorlons and Shadows reveal that they have been left as guardians of the younger races, but due to philosophical differences, ended up using them as pawns in their endless wars throughout the ages. The younger races reject their continued interference, and the Vorlons and Shadows, along with the remaining First Ones, agree to depart the galaxy forever.
　　After the Shadows are defeated Garibaldi leaves his post as security chief and works on his own as a "provider of information". He begins working for one William Edgars, a Mars Tycoon, who is married to Garibaldi's former love. While he works ever closer with Edgars, he becomes increasingly aggressive towards Sheridan and eventually leaves Babylon 5.
　　Minbar is gripped by a brief civil war between the Warrior and Religious castes. Delenn secretly meets with Neroon of the Warrior caste and convinces him that neither side can be allowed to win. She tells him that she will undergo a ritual wherein she will be willing to sacrifice herself, but will stop the ritual before she actually dies. When Neroon sees that she actually intends to go through the entire ritual, he rescues her and sacrifices himself instead, declaring that, although he was born Warrior, in his heart he is Religious.
　　As part of the ongoing conflict between Earth and Babylon 5, Garibaldi eventually betrays Sheridan and arranges his capture in order to gain Edgars' trust and learn his plans. Garibaldi later learns that Edgars created a virus that is dangerous to only telepaths. It is then revealed, that Garibaldi was actually abducted by the Psi-Corps at the end of Season 3 and re-programmed by Bester to provide information to him at the right time. Bester releases Garibaldi of his programming, and allows him to remember everything he has done since being kidnapped. Edgars is killed and his wife disappears, but is reunited with Garibaldi after the end of the war. Garibaldi helps free Sheridan and return him to the campaign to free Earth. An alliance led by Babylon 5 frees Earth from totalitarian rule by President Clark in a short but bloody war. This culminates in Clark's suicide and the restoration of democratic government. Mars is granted full independence, and Sheridan agrees to resign his commission. The League of Non-Aligned Worlds is dissolved and reformed into the Interstellar Alliance, with Sheridan elected as its first President and continuing his command of the Rangers, who are to act as a galactic equivalent of United Nations peacekeepers.
　　In the season finale, the events of 100, 500, 1000, and one million years into the future are shown, depicting Babylon 5's lasting influence throughout history. Amongst the events shown are the political aftermath of the 2261 civil war, a subsequent nuclear war on Earth involving a new totalitarian government in the year AD 2762, the resulting fall of Earth into a pre-industrial society, the loss and restoration of humanity's knowledge of space travel, and the final evolution of mankind into energy beings similar to the Vorlons, after which Earth's sun goes nova.

　　香港回归祖国后，荣凯集团总裁李国凯（郑少秋 饰）得以和在北京的胞兄李国荣（焦晃 饰）团聚。由于之前一直生活在不同的社会制度下，世界观、人生观不同，哥俩不久产生了摩擦。亚洲金融危机暴发后，李国凯的事业遭受重创，其次子李明捷（林申 饰）因与父亲分道扬镳致生意破产，大哥明浩（张永智 饰）和妹妹明思（曾宝仪 饰）均逃离家庭，整个家族濒临分崩离析。危难之机，大哥国荣出手相助，李国凯重新整合家族，渐渐走出困境。就在家业蒸蒸日上的时候，李国凯被医院诊断出绝症，面对灰心的胞弟，国荣捐献出自己的骨髓，挽救了国凯的生命。病愈的国凯欲将财产赠予大哥，伹哥哥的一番话让他明白了生存的价值......

　　甄善美（蔡琳 饰）是一个善良的女孩子，自小失去了母亲，在父亲的百般呵护下成长。善美也一直喜欢邻居的儿子佑振（韩宰硕 饰）。一天，父亲建筑公司里的一名工人在工地发生意外死亡，工人之女迎美（金素妍 饰）带了回家。
　　从小便缺乏家庭温暖的迎美十分妒忌善美能受到许多人的宠爱，于是她想尽了办法要跟善美争宠，更要抢走善美心爱的佑振哥。迎美在众人面前都是楚楚可怜的样子，致使佑振深深爱上了迎美。善美知道已无法挽回，带着受伤的心到美国留学，更认识了同是韩国人的尹享哲（张东健 饰），享哲被善美纯真的性格吸引住了。
　　回国后善美参加了电视主持人的甄选，更与迎美双双入选。迎美仍然嫉妒善美，处处跟善美作对，陷害善美。原来尹享哲是该电视台的理事，身为女友的善美却不知道享哲的真实身份。当迎美知道了事实后，便企图抛弃佑振，并不断向享哲示好。
　　深受伤害的佑振为了救回迎美而被卡车撞死，此时迎美才发现自己原来已经深深爱上了佑振，她开始反省自己所做的一切……

　　花满楼为陆小凤好友，出身于医学世家，自幼因病盲目，但有着高超的武功，和异常敏锐的听觉与嗅觉。
　　绣花大盗屡犯奇案，京城为之轰动。陆小凤被友所激追查此案，花满楼助之，二人终查出绣花大盗乃名捕金九龄，满楼与之打斗时檀香剑客杀出，刺死金九龄灭口。
　　西方圣教入侵中土武林，派卧底到中原各大门派，陆小凤、花满楼、西门吹雪察觉，并助各门派铲除奸细，三人更组织中原众高手一同深入楼兰。期间，小凤对薛冰的痴缠不胜其烦，却爱上风尘女子晶晶；满楼亦暗恋晶晶，但知其心仪小凤后黯然退出。晶晶本为圣教圣女，但她因恋小凤而不欲争教主之位。冰祖母薛夫人为救小凤而亡，使冰对凤心死。
　　中原另有一神秘隐形人组织与圣教暗中较劲，金九龄与檀香剑客均为其旗下杀手。隐形组织偷去圣教圣物罗剎令，使玉罗刹教主地位不保，并引起教中内斗。小凤等几经艰苦到神秘岛探查，得知隐形人组织首领为流云居士，其武功高深莫测，小凤与其契女牛肉汤施假婚之计才得以脱身。
　　某夜忽有女子潜入花家，被满楼察觉，女子自言名为慕容双，被歹人追杀，满楼相救。双深得花母好感，满楼也渐渐对双心生爱意。
　　吹雪妻子孙秀清被檀香剑客所伤，不治身亡。吹雪在小凤与檀香剑客打斗之时冲出，杀死檀香剑客报仇。岂料檀香剑客竟是满楼兄长花月楼，满楼悲痛欲绝。
　　冰离开花家独自飘摇，后偶遇流云，流云对冰悉心照顾，使冰感动，以身相许。
　　圣教长老日月二圣造反，欲废玉罗刹教主之位。晶晶为助玉罗刹平叛，勉为其难继任教主。小凤密探西方教坛，发现晶晶身份，大受打击，离晶晶而去，晶晶伤心不已，玉罗刹始道出她乃晶晶生母。
　　小凤等向中原武林公开流云的身份，流云约小凤公开决斗。小凤处下风之时，牛肉汤舍身相救，比武因而延期。西方圣教与隐形组织的争斗愈演愈厉，玉罗刹率众血洗珍宝岛；流云继而派人攻陷罗刹洞。玉罗刹约流云有所了结，原来二人曾有一段情，流云为晶晶生父。玉罗刹落毒欲同归于尽，岂料流云逃过大难，玉罗刹身死。
　　小凤与流云决战之期，全武林人士在旁观战。小凤施展绝技“凤舞九天”，将流云打落悬崖，流云经海底暗潜回珍宝岛。当夜雷雨交加，满楼与双双洞房花烛。暴风雨中海啸爆发，珍宝岛陆沉，流云、冰、牛肉汤均葬身大海。
　　小凤往楼兰寻晶晶，见其在神坛祈福，教众俯首，自知二人已无可能，返回中原继续其浪子生活。

　　电视台高级编导夏日长（陈展鹏 饰）筹备拍摄全新真人骚，纪录香港青年张俊杰（阮政峰 饰）从城市回内地体验农村生活反璞归真的实况，因电视台人手短缺，日长请了新入行的许美凤（黄翠如 饰）当助导，又找来好友梁忠信（麦长青 饰）当摄影师，拍摄过程中各人见证着代表港童的主人翁，如何面对在农村发生的文化冲突及个性被转化，各自在生活上的盲点因而被逐步揭露；像一向主观、事事执着的日长，重新检视与养母刘翠云（李司棋 饰）和生母夏笑娴（陈秀珠 饰）之间的爱与恨、勤奋真诚的美凤工作不眠不休原来只为重拾尊严，追回失落了的父爱、而大男人的忠信与家人之间的琐碎纠纷渐衍生成轩然大波，家庭四分五裂……
　　到底心灵的向导如何带他们走出人生的窘局﹖

海军罪案调查处的团队搜索一名嫌疑人和他们的动机后，一个大型设施的军事战斗无人机组装爆炸。Callen和Kilbride得到了在叙利亚发现一具尸体的令人不安的消息。

　　他们都在国家气象厅工作，她是勤奋努力的气象预报员，他则是个性无拘无束的同事。对他们来说，恋爱就跟天气一样阴晴不定，难以捉摸。