Game of Thrones
Series 7, Episode 3
The Queen's Justice.
Just like how last week's episode was made up predominantly of scenes of people sitting around tables talking about strategy, this week's episode consists almost exclusively of long character scenes where two (sometimes three) people stand in place and talk (or don't, as was the case in the scene between Ellaria and Cersei). That's pretty difficult to pull off, especially as most of these scenes are considerable in length -- without action to rely on, or even the dazzle of cool scenery, you have to rest everything both on your dialogue writing and the performances of your actors. If your actors can't sell the tension, and you can't get the audience invested in the scene in seconds, then all you've done is recreate the Star Wars prequels.
Luckily, this episode features some solid writing and some superb performances all around, with the best performances of the episode easily coming from Lena Headey as Cersei, Indira Varma as Ellaria (who actually doesn't have any lines), Dame Diana Rigg as Olenna, and Peter Dinklage as Tyrion.