Mazu, Rocky, Bill, and Tiny are going Gigantosaurus hunting. He may be the biggest, hungriest, and most dangerous dinosaur in the whole of the Cretaceous world, but these young friends won't let a little danger stop them.

Four dinosaur pals team up for big adventures around their community as they help others, solve problems, and learn about the mysterious Gigantosaurus (Giganto) that lives among them. Often it's Mazu's curiosity that leads the group's charge, and her friends Tiny, Bill, and Rocky eagerly join in her explorations. Whether it's returning a lost egg to its herd or saving an insect species from extinction, these dinosaurs never give up on a challenge....