There was a plan to use the Kzinti (from TAS' "Slaver Weapon") in an episode of Enterprise
. I'm just guessing that Larry Niven gave his OK to do that. The episode would have been called "Kilkenny Cats". They even gave a rendering
of what a Kzinti ship looks like. I always wondered what this episode would have been like....
Side note: The 'cat dancer' from ST V was supposed to be a Kzinti female, I think. That's what some backstage material said - she was referred to as a "Kzinretti" which is the official term (in Niven's 'Known Space') for Kzinti women.