Seconding what other people have said, this really is peak comfort who. Colin is in his element, Evelyn continues to be utterly delightful, and Nicholas Courtney steps so effortlessly back into the role it's like he'd never left, once the brig, always the brig.

The actual plot of this is pretty enjoyable too, but mostly it's those characters that bring this up for me, and I do love how much this setting gives everyone a chance to shine. Evelyn doing her research and talking to contacts in oxford, the Brig still kicking even in retirement, and the semi-globe-spanning nature of the story giving him a chance to call in those UNIT connections, and of course, the alien itself giving the doctor a lot to do, both with explaining the myths of the area and with the psychic abilities which gives him a chance to use his. That final scene too, character driven and oh so sweet, the sort of ending I love for these sorts of stories.

Overall a very solid 8/10 from me, and a main range story I could definitely see myself coming back to.