That was a very long, padded intro to our only trailer/preview for next week's episode. I'm beyond puzzled how this weird walking-behemoth-skeleton-and-suspicious-fairy-tale combo connects to the setup we saw earlier today...
The upshot is, more Carole Ann Ford. Until proven wrong, I refuse to believe they pulled an 84 year-old out of retirement to traipse around the TARDIS set for a while. Surprisingly, even to myself, Susan returning is now the part of the show I'm most invested in.