Other editions of book Jumper the Pony

Jumper, Thunder and Star are three ponies whose jobs are to give children rides at Mary's Pony Rides. They are tired of being kicked and having their hair pulled. They and their friend Jack, a stubborn donkey, try to find a way to make Thomas the bully stop being mean to them and to the children in school. But they can't let Mary in on their plan. Will their plan work or will it end in disaster?