Star Trek: Deep Space Nine, season 7, episode 19
Strange Bedfellows
Summary
An alliance is born between the Dominion and the Breen which will prove devastating for the Federation. Ezri and Worf are sentenced to death on Cardassia. Initially horrified, Kai Winn eventually accepts her visions are from the Pah Wraiths.
Summary from Wikipedia, CC BY-SA 4.0.
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