A little girl dreams of having her very own pet. But what kind of animal would make the best companion? A mouse is too small; a cat is too ordinary; and a fish is too... wet! As she plays with her toy dinosaur, inspiration strikes. What about a real, live dinosaur? At the end of a day spent busily imagining, the girl trudges up to bed with her little plastic dinosaur. As she falls asleep, the dinosaur from her daydreams stands in the garden with its head poking through the bedroom window, making her dreams come true.