In "The Story & the Engine", the Doctor stops off for a haircut in Lagos, Nigeria, and ends up with a little more than a short back and sides. A mysterious barber (Ariyon Bakare) is on the hunt for stories to power his scheme to topple the gods, and nobody has more memorable tales to share than Gallifrey's most famous export.

The Story & The Engine has a good story with interesting concepts, but sometimes gets lost along the way and misses its full potential.

Doctor Who fans talk a good game about how the series can go anywhere and be anything, but it's comparatively rare that an episode comes along that feels genuinely new. Last year offered us '73 Yards' – a real one-off that quickly became a strong contender,