Assertion: trek's episode | /r/HasProperty | trials and tribble-ations
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text: The Klingons, in whose presence tribbles produce a convulsive, shrieking reaction, consider them "mortal enemies", as stated in the Star Trek: Deep Space Nine episode "Trials and Tribble-ations" (1996).
text: Deep Space Nine episode "Trials and Tribble-ations", and in the closing montage of the final Enterprise episode
text: Simple theories that the different Klingons were different racial breeds were complicated by the fact that the characters of Kang, Koloth, and Kor appeared with smooth features in the original series, yet had a ridged appearance in Star Trek: Deep Space Nine, and that Worf acknowledged the difference in appearances when the crew of Deep Space 9 returned to the 23rd century in the episode "Trials and Tribble-ations", but offered no explanation, saying merely, "We do not discuss it with outsiders.