马上步入青春期的虫虫朱尼尔（Junior）在努力让同龄人接纳自己，但因被虫妈妈过度溺爱而常常被同龄人欺负。一天，在努力讨好朋友们时，朱尼尔意外地被铲车带到了地面，由此开始了一场伟大的冒险之旅——不仅是为了成为英雄，而且是为了整个虫虫社会。为了回家和拯救虫族，朱尼尔必须首先学会拥有自尊、信任和结交真正朋友的能力。Junior is a preteen worm who struggles to be accepted by his peers, only to get bullied for being spoiled by his overprotective mother. One day, while in an attempt to impress his friends, he is accidentally brought up to the surface by a shovel, thus starting a journey with great adventures and very high stakes - not only for the little hero, but also to the entire worms society. To get back home and save his own kind, Junior must first learn the powers of self-respect, trust and true friendship.