Doctor Who: All 40 Steven Moffat Episodes Ranked From Worst To Best

Well, what hasn't been said about this tentpole performance from Mr Peter Dougan Capaldi? Not much, really, and with very good, unsurprising reason. There's been so many totally deserved eulogies of Capaldi's standout act - by some distance on this list - that they've even run out of superlatives in the Gallifreyan language.

This is the Doctor stripped back; all alone, scared yet still his brilliant and funny self, nowhere to hide, merely running to bide precious time before the Veil inevitably catches up to try to extract another confession. The Doctor’s seemingly never ending downfalls make for our captivated gain.

Nevertheless, it still makes for brutal viewing seeing the Doctor bloodied, burnt and painstakingly dragging himself for a day-and-a-half to the teleportation room. It's like we're surveying him via the monitors throughout the water-locked castle, but there's nothing we can do to help our beloved hero.

Safe to say, we're punching along with him against that toughest of tough sonovabitch Azbantium wall. And over the course of four-and-a-half billion years, that amounts to rather a lot of television screens. The camera slowly panning along to reveal the Citadel on Gallifrey brings about a feeling of spine-tingling anticipation.

It’s not hyperbole to say that Capaldi’s solo outing ranks alongside Sandra Bullock in Gravity and Tom Hanks in Cast Away as the ultimate benchmarks in how to masterfully enthral an audience by their lone selves for a prolonged period.

Heaven Sent further cemented Capaldi's legacy as one of the greatest incarnations of the Doctor, and Moffat as one of the show's greatest ever writers.