The Doctor, seeking to show Rose an unusual event, takes her to the end of the Earth, literally. He takes her forward in time to the impending destruction of the Earth due to the Sun going super nova billions of years in the future.
They land on a specially designed orbital spacecraft that hosts end of the world events. All appears normal until strange robot spiders start causing mayhem.
The robot spiders imperil all onboard the orbiting spacecraft, and it's up to the Doctor to set things straight and find out who onboard is in control of these malicious robots. He must solve this dilemma quickly or a trapped Rose, the rest of the guests, and himself, die along with the Earth in the sun's death.