Series: 4

Original Air date: May 31, 2008

Number Doctor: 10th

Companion(s): Donna and River

Writer(s):   Steven Moffat

Director(s):  Euros Lyn

Guest Stars:
Colin Salmon as Dr. Moon
Eve Newton as The Girl
Mark Dexter as Dad
Sarah Niles as Node 1
Joshua Dallas as Node 2
Steve Pemberton as Strackman Lux
Talulah Riley as Miss Evangelista
Jessika Williams as Anita

Synopsis: The Doctor and Donna join a group of archaeologists at a 51st century library. What caused the library to become abandoned? What are the Nodes? And what links the library to one little girl? All they have is one warning – count the shadows.

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