"It all started at breakfast with the Timer. The new Timer that Tom's mum had bought for the kitchen. It looked a bit like a flying saucer and it was magnetic..." As soon as his mum tells him not to mess with the Timer, Tom is desperate to have a closer look. The blue light on the timer was winking at him so he decides press it. As his world starts spinning and is transformed into something unfamiliar, wonderful and just a little frightening, Tom goes off on a prehistoric adventure...