Dinosaurs are experts at roaring, and Rocky, Tiny, Mazu, and Bill are eager to have a contest to see who can roar the best. But they need another participant to round out the contest, and fierce Giganto is asleep! Can the dinos wake him up and make him roar? Little readers are invited to get into the act with the help of an attached Giganto puppet that pokes through the scenes helping him snore, chew, chomp a favorite snack, and even dance when Tiny sings. But what they're really after is much louder than that!