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The Doctor and Clara encounter a group of Vikings and manage to save them from the Mire. A solid episode with some intriguing points.

The Doctor journeys back in time to save the future but becomes part of events and unable to leave. Seemingly trapped and doomed to die he engineers an ingenious escape. But where did the idea for his plan come from?

Another spooky episode that continues the apparent Season IX theme of the Doctor's death.

A reasonable episode that explores a key aspect of the Doctor's past, tries to tidy up lots of loose ends and with a surprise change of routine.

The Doctor returns for Season 9 with an epic-scale episode that's full of drama, wit and menace. Overall it was a very solid return with just a few odd moments.

One of the better episodes rounds off this season. This Christmas special was very Christmassy with Santa making a strong cameo. The storyline was solid, although the many influences were a little hard to ignore.

A pretty good climax to the series with a rather macabre premise.

This episode began with a thoroughly disturbing theory of the afterlife, settled into a standard episode and then blew me away with an astonishing revelation and a great cliffhanger.

An atmospheric, as opposed to frightening, episode that stands up well. The Earth is covered in trees that have sprung up overnight. The Doctor, Clara and Danny find out why.

A clever, creepy and satisfying episode that gave Clara the chance to the shine while the Doctor is trapped.