When a suspicious allergy shot turns Chip into a beast with a head made of rock whenever he feels in danger, he uses the new ability to save his classmates from escaped animals at the zoo with the hopes of impressing a girl.
Eleven-year-old Crystal Frost and twelve-year-old Skip Loder mysteriously disappear the day before Mr. Descart's infamous math test coinciding with the appearance of a female yeti and a new mutant called the Dozer created by the evil General to capture the Rockhead.
