Star Trek: Deep Space Nine, season 3, episode 26
The Adversary
Summary
Ambassador Krajensky informs newly promoted Captain Sisko that there has been a coup on Tzenketh. He orders Sisko to take the Defiant to the nearby Federation colonies to ”show the flag” and keep the Tzenkethi quiet. Meanwhile, a Changeling hides on board the Defiant and sabotages the ship.
Summary from Wikipedia, CC BY-SA 4.0.
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