When Kira brings a terminally ill Odo back to the station for medical treatment, he orders her to leave him and return to help the Cardassian Resistance. Later, O'Brien and Bashir inform Sisko of their plan to lure a Section 31 operative, who may hold the cure to Odo's disease, to the station. The scheme works when Sloan, the director of the unsanctioned Starfleet extremist organization that infected Odo — as part of a genocidal plot against his people — arrives. But when Bashir places a Romulan mind probe on the agent, who refuses to give information regarding a cure, Sloan attempts suicide in the science lab by activating a neuro-depolarizing device in his brain.

Andrew Robinsion (Elim Garak)
William Sadler (Director Luther Sloan)

• The Final Chapter, Part 7 of 9.
  
• A.K.A. "Night Tremors."