Londo gets a visit from an old friend who seeks his help after being called a traitor by the Centarum. Sheridan starts hallucinating after being attacked by a dead alien.

A 100% fatal and 100% contagious plague is killing the Markabs. Dr. Franklin tries to find a cure, but is being opposed by the Markabs themselves, who believe the plague only affects the immoral.

Lyta Alexander returns to Babylon 5 with a message from the telepath resistance: one of the command staff is a mole for PSI Corps.

Kosh summons an inquisitor to test Delenn's motives, and G'Kar tries to maintain his position as leader of Babylon 5's Narn population while organizing an underground resistance.