Planet (Last Christmas)

On a very warm and damp rocky planet there was a thin fog and it sounded like there was lava nearby. The Twelfth Doctor appeared to have had some business to do on the planet when he was attacked by a dream crab. He later woke up from his dream, the dream crab died, and he took the TARDIS away from the planet. He only later realized that it was a dream within a dream and woke up on the planet, the dream crab died, and he took the TARDIS away from the planet. (TV: Last Christmas)