Star Trek: Deep Space Nine, season 7, episode 20
The Changing Face of Evil
Summary
The war reaches a crucial turning point when the Dominion retakes the Chin'Toka system, the only Allied foothold in enemy space. Winn learns that Dukat plans to release the Pah-Wraiths. Damar begins a revolt against the Dominion.
Summary from Wikipedia, CC BY-SA 4.0.
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