When a fatal disease spreads over Bajor, threatening the entire planet with extinction, Captain Sisko must accept aid from an unexpected source: Ro Laren, Starfleet officer turned Maquis renegade. Major Kira and Ro reluctantly join forces to track the alien plague to its source -- even as the disease claims new victims on Deep Space Nine itself. Dr. Bashir struggles to find a cure, but the secret of the virulent invader may hide deep in the shadows of Dax's past.

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