Funny story...I just started dating someone who likes DS9 and has never seen Voyager and durring conversation the plot of Threshold came up. He didn't believe that the lizard thing was an actual episode and insisted on watching it. Well after we watched it, he then wanted to go back and watch the whole show. So Threshold did get a DS9 fan to want to watch Voyager!
Well, maybe that's the exception that proves the rule.
