This is a really unusual story, in that it feels like a reject from the Philip Hinchcliffe era, even though it was originally commissioned for Season 15. It has all the hallmarks of the Hinchliffe era, with its hammer horror vibe, and yet it suits Season 18's more sombre vibes quite well.

State Of Decay is an excellent Doctor Who take on the classic vampire story. It adapts vampires into the Doctor Who universe arguably better than the new series' attempt with Vampires of Venice, with The Three Who Rule adding some great malice to the story. I liked the medieval vibes this serial was going for too, which gels nicely with the story that Terence Dicks is trying to tell.

My only gripe is that Adric is weirdly underused for a 'new' (at the time) companion. This is only his second story, and yet he's absent for a large chunk of it. He gets hardly any screentime with the Fourth Doctor and Romana, and in the little appearances he does make he comes across somewhat unlikeable. He may save Romana in the end from the vampires, but he still wanted to join them.