"The King's Demons." I get home from work later than I'd like, so I find myself watching Retro's broadcast even after vowing to stop before "The Leisure Hive." Besides, this one's a 2-parter and they show an hour so I got the whole story.
It again falls in the Master pointlessly disguised trope trap that we last saw in...well, the last time he was in an episode, "Timeflight." Why is he farting around with a horrible disguise in 13th century England? Does everyone in 13th century England know the Master? Did he plan for the Doctor to show up? Why the red hair? And furthermore, if his disguise is electronic (it pixelates away instead of being pulled off Scooby Doo style), why bother with Chameleon? Why not just be the king himself?
It is kind of neat, having his TARDIS be an iron maiden (although I understand they aren't historically accurate, but I digress), but then why does he spend all his time trying to put people in it? Why does the castle lord just take it in stride, after seeing the Master act like a turd the whole time he's there and then seeing his disguise stripped away, suddenly decide he's the Good Guy over the Doctor?
Another trope of this era is Tegan just taking the TARDIS for little spins. For 20 years, the Doctor has been barely able to get it to do what he wants, but Tegan regularly takes it on short hops without hopelessly stranding herself and everyone else.
Yep, this one isn't a terrible story, if you don't think about it too much. And at least it's over quickly.