Star Trek: Deep Space Nine, season 6, episode 17
Wrongs Darker Than Death or Night
Summary
When Dukat tells Kira that her mother, Kira Meru, did not die when Nerys was three, but was actually Dukat's lover, Kira goes into the past using the Bajoran Orb of Time to find the truth.
Summary from Wikipedia, CC BY-SA 4.0.
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