This was probably my favourite story of the series so far. Like Nikola Tesla's Night of Terror it forms a good solid mid-season story. It didn't deliver the fannish highs of Fugitive of the Judoon or Spyfall but its story had, I don't know, a better shape to it and felt more like a thing in its own right and less like a delivery mechanism for an arc plot.

( Spoilers under the cut )

I have a suspicion Praxeus may not age well on repeat viewing, and I doubt it will ever be topping series 12 polls, but I was happy.