This episode has a very classic feel, and honestly I think more of Thirteen's era should have been like this. She does best when in filler-type episodes, just running around having adventures with the fam. Though technically the stakes include the entire world, they feel small and localized, which I prefer. I like that the Sea Devils (unfortunately named, but that was established long before this) more or less maintain their classic appearance. The pirates (TWO different eras of Chinese pirates!) are great fun. The entire thing maintains the random yet earnest feel that made classic who so charming, only with impressive special effects.

And, of course, the relationship conversation was expertly handled. The Doctor in an ordinary romance would never have worked, and this was a great way to discuss that.