[DS9] Season 2, Episode 21 (Netflix: S2 E21): The Maquis Part 2
The continued story with the Maquis ramps up. Some hardcore Star Trek fans might not like it, but they do a good job at challenging Federation ideals, and I like that Sisko is put into a genuinely difficult position. The main thing that takes this episode from good to great is Dukat.
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Read more at Memory Alpha
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Notes:

Dukat was captured by the Maquis but the Cardassian high command isn’t bothered. They say Dukat was responsible for giving weapons to Cardassians in the demilitarized zone
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