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tribbles
History
Tribbles have appeared in several instances of Star Trek series and movies, arranged here in their order of production:
Original Series
Viewers first saw tribbles in the 1967 Star Trek: The Original Series television episode "The Trouble with Tribbles". The episode was written by David Gerrold, and the original tribble props were designed by Wah Chang. This episode was not, however, a depiction of first contact since it was a human named Cyrano Jones (Stanley Adams), a small-time merchant, who introduced the tribbles to Captain Kirk's crew.
In the same episode, Spock, a half-Vulcan himself, explains that Vulcans see no useful purpose for tribbles, so the species is not endearing to them, but it's not mutual for the ever-adoring species. However, he is caught petting one while claiming, "Fortunately, I am ... immune to its effects".
Animated Series
Tribbles returned in the Star Trek: The Animated Series episode "More Tribbles, More Troubles". This time, the tribbles Cyrano Jones brings have been genetically altered to not reproduce when they are fed, but instead they just grow larger. The tribbles are eventually taken care of by the use of the tribbles' natural enemy.
Movies
Tribbles make brief reappearances in the bar scene of Star Trek III: The Search for Spock and the evacuation scene of Star Trek Generations. Before that time, tribbles had been described as having been considered a dangerous menace to other planets' environments, so much so that transporting them off their native home could incur a lengthy prison sentence.
Deep Space Nine
In the episode "Trials and Tribble-ations" the crew of the USS Defiant encounter the tribbles once more when they accidentally travel back in time and participate in the events of "The Trouble with Tribbles". The Deep Space Nine characters are edited into scenes with the original series cast, although a few of the scenes are from different episodes. Each of the featured characters are seen in this episode, including Cyrano Jones and Arne Darvin.
In this episode, Worf reveals that the tribbles were hunted down and exterminated by the Klingon Empire; specially-trained warriors were sent to kill every tribble in existence, and an armada of Klingon vessels obliterated the tribble homeworld. Klingons are unique among Star Trek's races in their extreme hatred of these cute little creatures (the feeling was apparently mutual). This is because they were "an ecological menace", and emitted a loud shrieking noise instead of their normal soothing purr in the presence of Klingons. Deep Space Nine Security Officer Odo dryly remarks, "Another glorious chapter in Klingon history. Tell me, do they still sing songs of the Great Tribble Hunt?" A number of tribbles were brought back to Deep Space Nine from the past and the species was re-established.
Enterprise
The date of first contact with tribbles has never been established in canon. Chronologically speaking, the earliest known appearance of tribbles was in the 2003 Star Trek: Enterprise episode "The Breach" (which takes place in 2152) in which Doctor Phlox uses them as food for his medicinal pets in Sick Bay. Hoshi Sato, a human, sees a tribble being utilized by Phlox.
Star Trek: Armada 2
While not making an actual visual appearance, tribbles are used as a form of trade in the Star Trek computer game Star Trek Armada 2.
