Doctor Who: The Graves of Mordane

The Doctor has discovered the Darksmiths' Eternity Crystal and is determined to destroy it before it falls into the wrong hands. But to find out more about the Crystal, the Doctor must travel to Mordane, the peaceful cemetery planet. But once the sun goes down, Mordane turns into a planet of nightmares. Will the Doctor manage to hold on to the Crystal and fight off the living dead?