One liner, quip, random plot point, quip, the Doctor boasting, quip, a bit of plot that doesn't make a lot of sense, self-aware nod to the audience, one liner, quip, add a 'funny' turn by this episodes comedy guest star, mention something about how lonely the Doctor is, melodramatic moment, quip, running low on time because of too many quips so let's wrap up the threat in one sentence, quip, focus on the Doctor looking lonely, cue end credits. Pretty much sums up most 'light-hearted' Doctor Who episodes these days for me and I found that difficult to get through I'm afraid. I'd love to post something positive so I will say the guest cast were pretty good.