Tim is actually short for 'Tyrannosaur: Improved Model', and he's been created by a top-secret military experiment. Problem is, the new Prime Minister doesn't think he's worth the billions of dollars spent on his development. Luckily, before he can be put down, Tim escapes. Lucky because at the same time in another feat of mad science, a Professor Mallahide has gone to the opposite extreme - nanoscience - and created a swarm of nanobots. These more than microscopic machines can take anything apart (like skyscrapers or people), atom by atom, and then put them back together - exactly the same or altered. It is diabolical plan to make the world as he wants it to be. In between these forces are Chris and Anna (Mallahide's daughter) who must stop the nanobots, before the United Nations nukes Britain.
