The troll prince Trym has only three days to save his father, King Grom, who has turned to stone and had his tail stolen by the evil presence in the forest. Trym and his companions must go on a wild and dangerous journey across the troll kingdom of Ervod to save his father's life and return the kingdom to its rightful ruler.

Cuando el mundo se ve amenazado por un antiguo mal, las cuatro tortugas adolescentes deben reunirse y superar sus defectos para poder enfrentarse a él.