Stan Button had always dreamed of becoming a superhero. Then one day a letter arrives inviting him for an interview at the mysterious Mighty High School. To his amazement, Stan is offered a place – starting immediately. His superpower is ‘non-conventional', as are those of his two new best friends, but lessons in supervillain-spotting and tight-wearing mean they are soon ready to defeat the evil Green Meanie, who might just be none other than a teacher at their school…