Well, blimey. Who knew Rusty did dark so well*? Not since I was a wee small boy and saw Caves of Androzani have I felt so disturbed after watching a Doctor Who story.
Indeed, it’s not since Caves that we’ve really seen the Doctor get such a thoroughly good kicking, and certainly not deliberately, as the result of a carefully laid and executed plan. That was dark. Really dark. And I liked it, bar the occasional bits of Rustiness.