When his parents bring a little green lizard home from their vacation in Kenya, Jacob Two-Two is thrilled. But as the days pass, he realizes that Dippy isn't just an ordinary lizard at all. In fact, it becomes obvious to Jacob that Dippy's not so little either. As Dippy grows bigger and bigger, he begins to attract some very big attention from some very important people. Before Jacob realizes, he is on the run from the entire government of Canada - and with a full-grown dinosaur!