This episode started one way, and looked like it was going to be pretty dull, but then around the halfway point it became very interesting. I will confess, Nyssa is not one of my favourite companions and so I wasn't too thrilled by the idea of another Nyssa-centric episode, but I was pleasantly surprised by the way this episode turned.

I think, if my memory was a little better and I could remember more fully the events that led to them picking the older Nyssa up, this might have had more impact, but nevertheless I found the way she was torn between leaving her son behind to grow up without a mother, or shattering the timeline and going back for him to be quite heartwrenching.

However, it was when the Doctor's 'original' Type 50 TARDIS came into play that things got actually interesting. I was, as many are, a fan of Alien Bodies, and this very much gave me that vibe - I love it when TARDISes are a little eldritch and spooky. I mean a TARDIS possessing a corpse! I love that, personally, and that kind of mind bending, time manipulation, time machine too sentient for its own good thing really elevated this story into something good for me.