I’m shocked. This one is good! The guy who plays Thorne is the best actor in the show, genuinely menacing. He raises the game of the general cast. I have previously singled out Deborah Parsons as the best writer on this show, she returns in fine form. Because the cast is in much better form too at this point in the series, finally this script is able to sing to its full potential. The librarian alien in a cheap 1970s alien outfit is so camp and classic-Doctor Who like. I love it!