Other TV shows may break the fourth wall by talking directly to the audience. Doctor Who just blew it to smithereens — and it's been a long time coming.

As well as being a great visual, it's a handy metaphor for the show's newfound disregard for the so-called fourth wall — in the modern Whoniverse, fictional characters acknowledging their audience is becoming increasingly standard.

"Lux" saw Doctor Who get more meta than ever, with plenty of references to the sci-fi series' long history and nods to some fan favorite episodes.