Stardate not given: "Smiley" O'Brien kidnaps Ben Sisko to the Mirror Universe. The commander is supposed to pose as his Mirror Universe counterpart who has recently been killed. Only Sisko can convince a Terran scientist who happens to be Jennifer Sisko to join the rebellion. Among the rebels Sisko meets Dax who is his lover in this universe, and also Bashir, Rom and Tuvok none of whom is aware of his true origin. On Terok Nor Sisko and O'Brien are immediately arrested, and Sisko is taken to Intendant Kira, whereas O'Brien is put into the ore processing plant. Sisko finally succeeds in convincing Jennifer, who is divorced from him in this universe, to come with him. He gives O'Brien a secret signal upon which he arranges the Terran workers' escape. When the three are cornered by Kira's and Garak's troops, they threaten to self-destruct the station and are allowed to leave. Before Sisko returns to his universe, Jennifer Sisko reveals that she was aware that he wasn't her Sisko.

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