At the beginning of 2259, Captain John Sheridan replaces Sinclair as the military governor of the station. He and the mand staff learn that the death of President Santiago was actually an assassination masterminded by Vice President Clark (who assumed the Presidency upon Santiago's death). A nflict develops between the Babylon 5 mand staff and the Psi Corps, an increasingly autocratic anization which oversees and ntrols the lives of human telepaths. Commander Ivanova, the send-in-mand of the station, is secretly a latent telepath who has illicitly avoided registering with the Psi Corps.                                    
                               　　The Shadows, an ancient and extremely powerful race who have recently emerged from hibernation, are revealed to be the cause of a variety of mysterious and disturbing events, including the attack on the Narn outpost at the end of 2258. Centauri Ambassador Londo Mollari unknowingly enlists their aid through his association with the mysterious Mr. Morden in the ongoing nflict with the Narn. The elderly and ailing Centauri emperor, long an advocate of renciliation with the Narn, dies suddenly while visiting Babylon 5. A number of nspirators, including Londo Mollari and Refa, take ntrol of the Centauri government by assassinating their opponents and placing the late emperor's unstable nephew on the throne. Their first act is to st open aggression against the Narn. After a full-scale war breaks out, the Centauri eventually nquer Narn in a brutal attack involving mass drivers, outlawed weapons of mass destruction. Towards the end of the year, the Clark administration begins to show increasingly totalitarian characteristics, clamping down on dissent and restricting freedom of speech. The Vorlons are revealed to be the basis of legends about angels on various worlds, including Eh, and are the ancient enemies of the Shadows. They enlist the aid of Sheridan and the Babylon 5 mand staff in the struggle against the Shadows.