Despite the various hints along the way I somehow had no idea theSlitheen would appear in this story. That has to be the most delightful moment.

There are hypnotising fezzes and a get out of jail free card with the sonic screwdriver at the end - it’s all a bit silly and a bit of good fun.

This is a fun story, with the Doctor and the Ponds landing in the home of the fez and discovering that somebody is using them to control people. It features the return of the Slitheen, so how much you enjoy this story depends how much you like or dislike those alien creatures. Personally I was never a fan of them, I found them annoying and felt they downgraded the show's intelligence with all the fart jokes.

The central premise of the story with the mind controlling fezzes is quite an amusing and unique idea, but the ending is rushed and I just don't buy the Slitheen as a credible threat.