Sheridan prepares to be inaugurated as the first president of the Interstellar Alliance, despite a threat on his life. A new captain takes command of Babylon 5, and a group of telepaths seeks refuge.
A heart attack puts Londo on his death bed, forcing him to confront the evil he has done -- and to seek forgiveness. Lennier decides to leave the station.
Garibaldi petitions the station's colony of telepaths to aide the Alliance, while Sheridan and G'Kar try and get the new member worlds to accept a declaration of principles.
Lyta is caught in the middle when Bester attempts to capture the colony of rogue telepaths on Babylon 5 -- especially Byron, with whom he has personal history. Garibaldi confronts Captain Lochley, and Londo is assigned an unlikely bodyguard.
Mollari and G'Kar arrive on Centauri Prime, and are disturbed by what they learn of the Regent and the state of the empire. Byron presents Sheridan and the Alliance with an ultimatum.
Byron and his followers wall themselves up in Brown Sector to avoid capture. Londo and G'Kar discover an old friend locked in a Centauri dungeon, and the Drazi are convinced that the Brakiri are responsible for the attacks on Alliance ships.
Bester attempts to take control of the sensitive telepath crisis, which soon escalates toward violence. Byron reveals his personal connection to the Psi Cop, and Garibaldi's attempt to exact revenge on Bester is thwarted.
Lochley sells a portion of the station to the Brakiri for one night, so they can celebrate an important holiday -- causing several station residents to experience personal encounters with deceased loved-ones. Entertainers Reebo and Zooty visit the station.
Delenn sends Lennier on a secret mission to gather evidence about Centauri involvement in the attacks on Alliance ships, but a training session puts him and a fellow trainee in mortal danger. Vir receives a promotion.
Lennier finds evidence as to who is behind the recent wave of attacks on Alliance ships. Lise confronts Garibaldi about his drinking problem when she visits the station, and Lyta becomes the rogue telepaths' new advocate.
Sheridan and the Alliance confront Ambassador Mollari about Centauri involvement in the attacks on their ships, leading to a fracture in the Interstellar Alliance.
As the Alliance member worlds plan to strike Centauri Prime, Delenn and Lennier travel to Minbar and come under attack. Franklin and Lyta visit the Drazi homeworld on a mission of mercy, and make a discovery that could throw the Alliance into chaos.
Londo comes face-to-face with his dark destiny, as Sheridan and the White Star fleet rush to save Centauri Prime from the Narn and Drazi. Faced with death, Lennier makes a confession to Delenn.
Garibaldi finds hope for a new future after Sheridan and the others confront him about his drinking problem. Lyta is arrested when it is discovered that she orchestrated attacks on Psi-Corp facilities.
Garibaldi and Lise find themselves the targets of an assassination. Lyta and G'Kar prepare to depart the station, and the Alliance gains a new head of security.
Sheridan and Delenn bid farewell to Babylon 5 and depart for the new Interstellar Alliance headquarters on Minbar. Lennier makes a terrible mistake that will change his life forever.
