Star Trek: Deep Space Nine, season 5, episode 6
Trials and Tribble-ations
Summary
Darvin, a disgraced Klingon spy, travels back in time. The DS9 crew must prevent him from altering the timeline. Based on the original Star Trek episode "The Trouble with Tribbles" by David Gerrold.
Summary from Wikipedia, CC BY-SA 4.0.
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