Big Finish Doctor Who/Recap/009 The Spectre of Lanyon Moor

The Doctor is reunited with his friend, the now-retired Brigadier Lethbridge-Stewart, at an archeological research centre in Cornwall; previous attempts at excavating the moor and its fogou have been abandoned on account of an unearthly presence, driving the workmen to madness or even death. The legendary spectre of Lanyon Moor is more than it seems, and after eighteen thousand years of imprisonment, he is preparing to take his revenge on the entire Earth.

Tropes

 * Genre Savvy: Despite never having met this particular incarnation before, it takes the Brigadier all of 2 seconds to recognise the Doctor when he bursts in the door in his rainbow coat bellowing "Lethbridge-Stewart, you old rogue!"
 * Kill Em All: None of the major guest cast survive.
 * Mood Whiplash: At the end the Doctor, Evelyn and the Brigadier head off to the pub asking about chocolate puddings, seemingly uncaring of the six people who have died.