The crew has to protect the grain that will be planted on a planet from the klingons. so they must go down to the station where they meey cyrano jones who sells tribles. He sells one to the lady and the tribbles begin to reproduce like crazy and soon begin to eat the grain that was suppossed to be protect. some of the tribbles die because of the poisioned grain by the assistant who was really a klingon. they figure this out when the tribbles do not like the tribbles. the tribbles are beemed aboard the klingonshipm at the end of the episode.
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