The plot of 'Doctor Who: Last Christmas' involves the Doctor and Clara in a seemingly ordinary arctic base at first. But soon, they discover the presence of Dream Crabs. These Dream Crabs are able to create illusions within people's dreams. The story is a complex web of the characters believing they are in one reality when in fact they are in a dream world created by the Crabs. The Doctor has to use his intelligence and experience to not only figure out the truth but also to rescue Clara and the others from the Dream Crabs. It's a story full of twists and turns, and it also delves into the relationship between the Doctor and Clara in a very interesting way.
Well, 'Doctor Who: Last Christmas' is quite a wild ride. The Doctor and Clara find themselves in a wintry setting which is actually part of a much bigger problem. The Dream Crabs are these menacing creatures that latch onto people's faces while they sleep. It's all about the characters trying to break free from the false reality the Dream Crabs are creating. There are some really cool moments where the Doctor is trying to piece together what's going on and how to defeat these aliens. It also has some heartwarming moments between the Doctor and Clara.