Release Message:  With the library darkening, the Doctor takes on the Vashta Nerada while figuring out what links River Song to his future. Meanwhile, Donna (Catherine Tate) finds out the mystery of Dr. Moon and the Girl.

Description:  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.