
If Peter Capaldi is not your favorite version of the Doctor in Doctor Who, that’s understandable. After back-to-back youthful and energetic Doctors from 2006 through 2013 (David Tennant, Matt Smith) the Doctor regenerated into an irascible crank, a kind of throwback to earlier versions of the long-running sci-fi series. And yet, on November 28, 2015, in the penultimate episode of Season 9, Doctor Who released what is easily the best standalone entry in the series ever. Here’s why Who never topped this one and why it’s one of the best hours of sci-fi TV in the 21st century.