20x21 The King's Demons Part One [3rd watch]
Any Doctor Who fans reading this will notice that, despite my stated aim of watching a four-parter after every new Who episode this year, The King's Demons has only two parts. There are a couple of reasons for this: one, it has the best connection to Robot of Sherwood that I could think of (it's set in the same era, with the same king on the throne; and, in the second half, features a robot); two, it has a neat connection to a story we'll be watching later (more on that when we get there); and three, due to a familial invasion we only have time for a two-parter this week anyway -- what serendipity!
1x15 (5/9/14 edition)
[Watch it (again) on iPlayer.]