A funny story about a dinosaur in Jack's mother's veggie patch. The boys try to get rid of the dinosaur by sending him back in time, but encounter the dangerous Giganotosaurus. Jack finds a Tyrannosaurus in their veggie patch. This causes a giant problem as dinosaurs are very big, and eat a lot. Jack, his best friend, Toby, and dog, Charlie, try to hide the dinosaur, but soon realise that they have to send the dinosaur back to his own time. So with a little help from Toby and the magic chalk he got for his birthday, they invent a time machine to take the dinosaur home. But something bigger and scarier than a Tyrannosaurus waits for them - a Giganotosaurus!