On the outside, 12-year-old Arthur (Hunter Allan) looks like your typical nerd, harassed by bullies and hopelessly awkward. But a blue-skinned troll (Richard Sellers) with magic powers knows that Arthur is far above average -- and that he holds the key to saving civilization. In the meantime, Arthur has to convince his mom (Lea Thompson) that he isn't making up stories about his school's evil vice principal (Wendie Malick) and a powerful dragon.