Dead Man’s Hand

Another really strong story. This one sees the Doctor and Clara team up with Calamity Jane and Oscar WIlde to fight an alien threat who appears to have met a previous incarnation of the Doctor. It's set in the Wild West town of Deadwood, and has a spooky idea at its core regarding a dead man in Wild Bill seemingly killing people from behind the grave as 'the masked gunman'.

I love how this story ties to 'The Forgotten', which in itself was a great Tenth Doctor comic story, and it's always fun seeing historical figures with the Doctor.