Stardate not given: Jennifer Sisko appears on Deep Space 9 and takes her "son" Jake to where she comes from, the Mirror Universe. When Ben Sisko follows them using a device she left behind, he is welcomed by "Smiley" O'Brien and other rebels from that universe who have gained control of Terok Nor. The fleet of the Klingon-Cardassian Alliance led by Regent Worf is approaching the station, while the rebels are working to finish their copy of the Defiant - with the help of Captain Sisko whose son is in their hands. Sisko decides to lead the rebels' attack himself, and the small agile fleet proves successful against the crude warships of the Alliance. When Jennifer Sisko is about to send Jake back to his universe, Intendant Kira, who has been a prisoner of the rebels, steps into their way. Kira points her weapon at Jake, but Jennifer jumps into the line of fire and dies soon after.

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