 Sparrow and her best friend's brother, Larry Nightingale (Finlay Robertson), must unravel a set of cryptic clues sent through time by the marooned Doctor, left in DVD Easter eggs.Both the Doctor and his companion Martha Jones, played by Freema Agyeman, have very little screen time in this episode, which allowed for another episode to be filmed simultaneously; "Blink" is consequently sometimes referred to by fans as a "Doctor-lite" episode.The scenes at Wester Drumlins were shot in a derelict house in Newport.