G'Kar discovers that an ancient enemy has returned, while Garibaldi learns who tried to kill him. Sheridan is forced to face the memory of his dead wife when his sister visits the station. Delenn emerges from her transformation.
A group of Techno-Mages passages through the station on their way to a mysterious destination, and Mollari seeks an endorsement from their leader. Ivanova receives a promotion, and mediates a violent conflict between the Drazi.
A sleeper ship from 100 years in the past is brought to the station, carrying a deadly alien force. A lurker must confront the terrible memory of his past.
Talia becomes the target of a programmed killer after the murder of her former mentor, who was negotiating for a peaceful solution to the issue of Mars' independence.
Mollari's three wives arrive at the station and receive unfortunate news: Londo has been granted permission to divorce two of them. A man from Talia's past returns for her.
The Centauri emperor comes to the station to deliver a message of peace, while Londo and Lord Refa plan an attack on the Narn. Garibaldi receives a message from an old friend.
An Earthforce infantry division stops at B5 for some R&R before proceeding to a dangerous invasion. Dr. Franklin tries to reconcile with his father, the unit's commander.
Sheridan is captured and forced to fight other aliens on board a prison ship. Delenn's fate is decided when she is brought before the Grey Council. General Hague visits the station.
A fugitive from Earthgov flees pursuit to Babylon 5 with a deadly secret, and Garibaldi and Franklin must circumvent the station's own security forces to find him and protect him. Sheridan begins a strange dialogue with Kosh.
Sheridan discovers a connection between Mr. Morden and the death of his wife, and risks his career by holding him without charges and interrogating him. A representative of the Ministry of Peace tries to recruit station personnel for the Nightwatch, and Dr. Franklin tries to cope with the massive influx of Narn refugees.
An old friend visits Ambassador Mollari, only to reveal that Londo's new allies are passing a resolution to disgrace him and his family. Sheridan becomes the unwilling host of an alien energy force.
Dr. Franklin discovers a plague that is threatening the life of the entire Markab race -- sending the station into a panic. Delenn and Lennier risk their lives to comfort the dying.
Telepath Lyta Alexander returns to the station, claiming that one of the crew has an artificial personality programmed by a secret government organization to spy on them.
The Centauri attack the Narn homeworld, ushering in a new occupation -- and altering the course of G'Kar's life. Captain Sheridan discovers powerful new friends and allies.
The Vorlons bring an Inquisitor to Babylon 5 to test Delenn's ability to lead the army of light in the coming Shadow War. G'Kar looks for support from the other Narns on the station.
Sheridan gives sanctuary to a lone Narn battle cruiser, putting his own life in danger. Earth takes sides in the Narn-Centuari War. Lieutenant Keffer finds what he's been looking for.
