Stardate 47879.2: After experiencing difficulties in passing through the wormhole, Kira and Bashir find themselves in the Mirror Universe. Here a certain Spock has disposed of the cruel Captain Kirk a century earlier, and initiated a chain of events that ended in the Terran Empire being subjugated by the Cardassian-Klingon Alliance. Mirror Kira oversees the station Terok Nor of that universe, aided by Mirror Garak and Mirror Odo. Bashir is sent to work in the ore processing where he meets the disillusioned Mirror "Smiley" O'Brien who won't help him. Mirror Kira develops a strange fascination for her look-alike. However, Mirror Garak plans to get rid of Mirror Kira, using Kira to pose as her evil counterpart. He threatens to kill Bashir if she doesn't side with him. While Kira attempts in vain to convince Mirror Sisko, who has more privileges than the other humans of this universe, to support their cause, Bashir manages to kill Mirror Odo and escapes together with O'Brien. When they ae caught and about to be publicly executed, Mirror O'Brien speaks up and tells the crowd about the Mirror Universe. Now Mirror Sisko is moved and helps Kira and Bashir to escape to their universe.

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