This season’s penultimate episode delivers a fairly solid story, makes effective use of location filming, provides clues to the latest destruction of Gallifrey, and introduces a mystery that will obviously be central to the conclusion: Who is Brendan? If nothing else, we have a Doctor Who episode that, for the most part, should please viewers both traditional and new.

We’ll post a proper review next week, after Part Two airs. Meanwhile, here’s a place to offer opinions, ask questions, and explain your timeless theories about Brendan’s identity.

How about: Brendan is the original Time-Lord. All founding Time-Lords are incarnations of him, and so many that they have become a population (others, like Susan, would be born later, of course). No, I don’t believe that, but it’s probably not the most outlandish claim being made by fans. What’s yours?