This movie puts Henk Ketcham`s comic figure `Dennis` into real life: While digging in his front garden, Dennis finds a big bone. To prove it`s from a dinosaur, he persudades his father to invite an old buddy of him, Bowen Skyler III, who`s a famous `dinosaur hunter`. Being desperate for publicity, Skyler informs press and television... and starts a paleontologic dig in their front garden!