I'm not sure I have a favorite yet. I've only got season one from Itunes and hope to have the entire series on DVD soon. However, the one I liked the least was Childs Play. I thought it was an unnecessary and dumb episode where they landed on some alien world where they were shrunken down to toy-size and the alien-child was playing with them. That episode to me was just a filler and didn't need to be there. Second one would be I think it was called something like "A girl in love with Powerglide?" another silly unnecessary episode.