Admiral Ross at Starbase 375 uncovers a major reason for the Dominion's dominance - a sensor array monitoring all activity across five sectors. Sisko soon formulates a risky plan to disable it. Back on Terok Nor - the Cardassian name for Deep Space Nine - Kira and her "resistance cell" of Jake, Rom and Odo work to foster ill will between the Cardassians and the Dominion. When Odo speaks out against her latest scheme, Kira begins to question his loyalty.