There was a series of short cartoon episodes (all around the 2 minute mark) centered around the series 1 zelfs, and I'm not sure if they were released anywhere other than YouTube.. There is only 12 episodes (or 13 if you count the Christmas song, which for some reason the official The Zelfs channel considers it so) and they don't follow any plot, of course. Just a quick situation/gag with a few zelfs. I think it is so adorable and if you like these little things at all, I recommend you watch it actually ! I really enjoy that Vampula is a southern vampire Lol

If you just click there and go to their YouTube channel, theres a playlist of all episodes
I was originally going to write a small summary of every episode, but as soon as I started rewatching them for it they're just so so short and contentless that it doesn't even make sense to do that Lol You could probably watch them faster than I can explain em!