Star Trek: Deep Space Nine, season 7, episode 2
Shadows and Symbols
Summary
A new Dax appears on the scene. Sisko's quest leads him to the truth about his existence. The discovery that the Romulan hospital is heavily armed leads Colonel Kira to set up a blockade of Derna. Bashir, O'Brien and, surprisingly, Quark join Worf and Martok on a dangerous mission to destroy the Dominion shipyard.
Summary from Wikipedia, CC BY-SA 4.0.
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