In the first two instalments of this series we've travelled the airwaves with TV science fiction, and sat riveted in our seats at the movies. Now we move to the more intimate worlds of silicon and paper. It might seem that books and computer games are miles apart, but though there's a great technical gulf, they are the closest in flexibility and imaginative impact, making them ideal companions. If you think science fiction isn't for you, check out some of the book recommendations - you may be surprised.