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With the library darkening, the Doctor takes on the Vashta Nerada while figuring out what links River Song to his future. Meanwhile, Donna finds out the mystery of Dr. Moon and the Girl.
Length 45 minutes
Colin Salmon | David Tennant | Steve Pemberton | Catherine Tate | Talulah Riley | Alex Kingston | O.T. Fagbenle | Mark Dexter | Jason Pitt | Harry Peacock | Jessika Williams | Eve Newton | Alex Midwood | Eloise Rakic-Platt | Jonathan Reuben