Which simpsons episode did steve urkel apper in?

I know in ''helter sheltler'' urkel-o's apper in but which episode does the real deal apper in??? check out this video clip of it a href="http://www.youtube.com/watch?v=xhvD_HlunOw" rel="nofollow"http://www.youtube.com/watch?v=xhvD_Hlun…/a