Summer of 2014 is here in St. John, a small town in Northwest Indiana. Life is very busy for the Grzedek family, as the kids' oldest brother, Andrew, moves to Valparaiso, Indiana after graduation from college, and their sister, Alyssa, goes on vacation with their mom. Caleb, Adam, and Cameron decide to visit Galavanti Island, otherwise known as the Jazzy Island of Dinosaurs, and they visit Dacston, a T-Rex, Valpatic, a velociraptor, Jokie, a brachiosaurus, and Sammy, a stegosaurus. Once the three boys come to the island, they have to help put a stop to Dacston's selfish cousin's hopes to run the Annual Fiesta.