Forest of the Dead

"Forest of the Dead" is the ninth episode of the fourth series of the British science fiction television series Doctor Who. It was first broadcast by BBC One on 7 June 2008. It is the second of a two-part story; the first part, "Silence in the Library", aired on 31 May; it was Moffat's last written story before replacing Russell T Davies as head writer and showrunner starting from the fifth series in 2010.

In the episode, the time-travelling temp Donna Noble is trapped inside a virtual reality in a planet-sized library's hard drive in the 51st century and has false memories implanted of a married life. At the same time, another time traveller, the Tenth Doctor, seeks to rescue Donna and thousands of other humans saved inside the library hard drive while being pursued by a microscopic swarm known as the Vashta Nerada. The episode also features the death of River Song, who goes on to become a recurring character. She is an archaeologist who has a close relationship with the Doctor, but because of the non-linearity of this partnership, the Doctor in the episode has only just met River.

Forest of the Dead was watched by 7.84 million viewers. This came out to a 40% audience share, the highest in series four. It received highly positive reviews, who praised the character of River Song, and Tate's performance. This episode, along with "Silence in the Library", was nominated for a Hugo Award in the Best Dramatic Presentation, Short Form category.