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Invasive Procedures

DS9 is evacuated to avoid endangering any personnel due to the passage of a plasma storm. A handful of renegades infiltrates the nearly-abandoned station with the aid of Quark, who doesn't know what they're really after. The leader of the intruders is Verad, a candidate for Trill host who was rejected by the symbiosis evalutation board as unfit for the joining, and he intends to steal the symbiont Dax. As the crew is held hostage, Bashir is coerced into performing the operation to implant Dax into Verad. As Bashir struggles to keep Jadzia alive long enough to reunite her with Dax, Sisko tries to keep the newly integrated Verad Dax talking in hope of appealing to his mentor's better nature.

Deep Space Nine, seizoen 2