Some of the strongest, most striking episodes of Doctor Who are those that have drunk deep of the horror well.  Ostensibly a children’s show, Doctor Who has often taken great delight in terrifying the kiddies.  In Britain, the term ‘behind the sofa’ is directly related to the show’s ability to send the watching kids scurrying for the safety of the rear of that comfortable piece of furniture, safe from the harrowing images on screen.