Stardate not given: When Keiko O'Brien returns from Bajor, Miles is shocked to learn that his wife's body is possessed by an alien conscience. The entity demands that O'Brien make some modifications to the station's impulse response filters in the subspace communication emitters. O'Brien decides to seek the captain's advice, but the entity demonstrates its power by dropping Keiko from the upper level of the promenade deck. O'Brien carries on with his sabotage and swears Rom to secrecy about it. After evading Odo the two have almost completed the task when Rom explains that the modifications can be used to kill the wormhole aliens, the Bajoran Prophets, with a chroniton beam. O'Brien recognizes that the Pah-wraiths want to eradicate their ancient adversaries. He takes his wife on the runabout and activates the weapon. But instead of the wormhole the beam hits the runabout, and the Pah-wraith is expelled from her body.

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