Clyde and Rani awaken one morning, to discover that everyone on Earth has mysteriously vanished, even Sarah Jane and Mr. Smith. Whilst exploring the deserted London, they encounter a boy named Gavin, who's just as confused as they are. Eventually, the force behind the disappearance of the human race make themselves known, a pair of cyclopic robots, one red and one yellow, began to chase the three teens through the deserted streets.