For me it's a toss up between NOS and Ghosts. I just don't see how either voodoo or ghosts fit in to the show. Both A plots are just awful and I don't think I've read a story dealing with either episode. Maybe the plots are just too terrible to fix?

I actually like smart kids but maybe it's because I was that age when the episode originally aired (I was 10) and saw it live, so I base my opinion on my first time seeing the episode. What 10 year old wouldn't want to be able to be them, in control and run everything for a little while? It fit in with a lot of what was on tv at the time for my age group. I guess if I had been an adult seeing it for the first time, I would have a more negative opinion of it.