This is a pretty fun episode. Not only did I enjoy the Weakest Link parody, though it does date Bad Wolf severely, it's also a great pay-off to the season arc in a way I found the show would always struggle with more in the future. Here, it feels a lot more organic and I get quite a bit out of the growing dread that occurs in the Doctor as events unfold around him. We go to a silly retread of The Long Game into some really solid set-up to the finale. A good episode that I find really replayable.