Doctor Who Series 4 - Forest of the Dead Trailer

An enigmatic message sends the Doctor and Donna to a planet-sized library. They arrive to find the world deserted, except for an archaeological expedition led by Professor River Song, who claims to know the Doctor of old. Joining forces, the Doctor and River investigate the mystery of why the library was sealed off a century earlier. But the shadows are alive with a flesh-consuming intelligence... and somewhere, a little girl believes that all of these events are playing out in her mind.