Eight months after Lt. Commander Michael Eddington betrayed Sisko and deserted Starfleet to join his fellow Maquis confederates, he resurfaces, and as the Defiant follows, Eddington triggers a cascade virus that renders the Defiant's computer useless. An angry Sisko is forced to let another captain take over the search for Eddington, as Eddington begins unleashing biogenic weapons against Cardassian colonists in the DMZ. When Sisko decides to go after Eddington regardless, he must face the possibility that he is becoming dangerously obsessed.
