I'm disappointed with this series so far, there are too many "storyline arc" episodes and not enough quirky fun stand-alone ones. And I hate, hate, hate episodes that end "It was all just a lovely dream!" pulling the rug out from under you. I struggled to follow a two parter in good faith and then they go and pull that crap at the end of the episode.
It's a KID'S PROGRAMME! It should be intelligible to the little ones! Won't somebody please think of the children? (And the adults who like their narratives linear and nice easy to understand resolutions!)