Star Trek: Deep Space Nine, season 4, episode 5
Indiscretion
Summary
Forced to bring along Dukat on a personal mission to investigate the fate of the Cardassian prison ship Ravinok, which disappeared six years ago, Kira discovers the real reason her old enemy wants to accompany her. Sisko appears to have reservations about Kasidy Yates' coming to live on the station.
Summary from Wikipedia, CC BY-SA 4.0.
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