Best episode so far! They were obviously enjoying the ripe dialogue and played it to the hilt. Sort of Witchfinder General or Blood On Satan's Claw with a sense of humour. It was about time we had a decent villainess. Liked the anti-scapegoating message too, to be aware witch hunting hasn't gone away, but they didn't let it take over the story and it remained a rip-roaring adventure. A bit of a shame Alan Cumming will never be the Doctor as they asked, but he was a riot as James I.
Oh, and what's wrong with Scooby-Doo (apart from Scrappy)? Scooby-Doo: Monsters Inc is one of the greatest cartoon series of the century.