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.

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.

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.