All the horses of Storybook Stables are excited to meet the latest addition to their herd. As Marvin the miniature horse arrives in a trailer, the horses think he is the tiniest and cutest horse they have ever seen. Unfortunately, Marvin is not as excited to meet them as they are him.

Every time one of the big horses approaches to welcome him, Marvin frowns, backs his ears, shows his teeth, and charges. When the big horses grow tired of his rejections and decide to leave him alone, Marvin calls the horses names, treats them badly, and bullies them into giving up their grass and water. Will the caring herd ever find a way to teach Marvin a lesson in kindness and friendship?