A creature from Star Trek that breeds like crazy. Wiped out by the Klingons, but a starship from the future brought one back into its own time, thus restoring the species.
1. PURE EVIL
2. A ball of fluff that procreates rapidly and drains an entire species of resources until they collapse. The species does not notice because the tribbles are "cute."
3. Parasite, abomination
The tribble was taken onboard the ship of unsuspecting idiot Earthlings who figured it was a cute pet. THEY WERE WRONG.