1.Invader Zim, of course. Why it has waited so long for the mention? It was even denied actual end that creators wanted to make, as "it could get ressurected". And what came out of this? Nothing. Hell, many *finished* episodes weren't even aired.
The rest I don't really care about, to be honest, as Poland is horribly deprived of Sci-Fi shows, and I had to download IZ to watch it at all. There was Babylon 5 that ended recently and was shown so early that I had to wake up earlier to even get a chance to watch it, and the final episode was shown even earlier, so I missed it. And there is Star Trek, too, but I don't like it.
So, as a token nominations, I'll say Babylon 5: Crusade [AFAIK, it was going to be better when JMS pulled the plug] and S:AAB, as IIRC it was shown in Poland a long time ago, and so it deserves at least a bit of recognition.