The law of diminishing returns is delighted to present yet another classic Doctor Who adventure turned suggestively filthy by judiciously-placed bleeps and pixels. Happily, this is one of the better examples of the genre, with some proper LOLs being evoked by Tegan’s crotchety Aunt Vanessa and the Doctor’s remark to a prostrate Master: ‘One good @#*$ deserves another, don’t you think?’