I really loved this one. The opening monologue with Quill and how it relates to the rest of the story is brilliant, and the narrative has this really creepy vibe which evokes Children Of Earth and Midnight.

Dervla Kirwan is such a perfect replacement for Katherine Kelly, to the point where you forget it's not Katherine Kelly you are actually listening to.

I love the concept of The Cleaver also. It's like Class's version of the Trickster from The Sarah Jane Adventures, but even crueller.