I never cared for the original Tribbles episode, although I loved what DS9 did with it. "The Trouble With Tribbles" did bring out some of TOS cast member's better acting, however, but you kind of have to put forth an extra effort when your co-stars are mohair bean-bags.
My favorite episode of TOS was "The City on the Edge of Forever." Now there was a well-crafted show.
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@ Steven Lyle Jordan: As for man-eating plants, I'm sure somewhere out there there are some vegetables who like us better than we like them.