The title for the fourth episode of Season 6 has been revealed as "The Doctor's Wife".

The episode is written by fantasy/graphic novelist Neil Gaiman and features a mysterious character named Idris. Gaiman said to Doctor Who Magazine: "Idris is someone who is beautiful, and who bites, and who might just turn out to be an old acquaintance with a new face...", adding, "it starts in void-space, with something – or someone – we have not seen since The War Games, and a knock on the TARDIS door..."