<p><i>"We won''t find Dracula hanging around the Manor. But we may find something equally disturbing..."</i><br><br>The Doctor is delighted when his quest for the Key to Time leads him to his favourite planet, Earth. But his friends are less enchanted: Romana is nearly lured to her death by a sinister apparition, and K9 is all but destroyed by a belligerent boulder with the power to move - and a thirst for blood.<br><br>An ancient stone circle becomes a battleground as the Doctor must outwit the deadliest alien criminal this side of hyperspace - and her bloodthirsty silicon servants...</p>