Doctor Who: Silence In The Library

One hundred years ago, the Universe's greatest Library was sealed off, leaving only one warning: "Count the shadows". But now, the shadows are moving again.

In Doctor Who on Saturday 31 May on BBC One, the Doctor and Donna must uncover the terrible truth behind the Nodes and the horrifying Data Ghost, to find the Library's secret.

David Tennant plays the Doctor and Catherine Tate plays his companion Donna Noble.

Alex Kingston, Colin Salmon and Steve Pemberton guest star.

Doctor Who: Silence In The Library (series 4, episode 8/13), BBC One, Saturday 31 May 2008, 7pm.