Doctor: Who wants to go to 2015 Earth? Shalek: (Eating chocolate) sure, as long as they have this brown food, what's it called again? Alfie: It's called chocolate and they have it in 2015 Doctor: Setting the course to 2015 at the Great Wall of China Alice: Yay! I always wanted to visit the Great Wall of China (The TARDIS lands and the crew walk out to see bombs flying everywhere and the Great Wall of China destroyed) Shalek: Where's the Great Wall of China? Alfie: It's - Doctor: Destroyed. But it doesn’t get destroyed until way after 2015 Alice: Something must be changing time Shalek: It's like a war.