Clarence is a super strong hero known as Mighty Truck, but today he is facing his toughest mission yet: babysitting. On his rare day off, Clarence kindly offers to watch his friend Hattie's little bulldozer cousins, Zip and Beep. He thinks it will be a relaxing afternoon, but these two youngsters have an endless supply of energy. From wild games of tag to jumping jumper cables, Zip and Beep simply refuse to run out of gas. Clarence is zooming everywhere just trying to keep them out of trouble, and his tires are getting tired. How can one superhero keep up with two hyperactive bulldozers who never want to slow down? Find out if Clarence has enough power to survive the playdate in this fast paced adventure. This funny, high energy story is perfect for young readers who love big machines and loud action.