Cavin, a knight-in-training in the Dunwyn Kingdom, is left in the woods after a group of ogres run off his human allies. There, he stumbles into the home of the fabled Gummi Bears while trying to find his Great Gummi Medallion, which was left to him by his grandfather. When learning of an incoming attack by Duke Igthorn, Dunwyn's disgraced knight turned traitor, Cavin must convince his new friends to help stop this enemy while promising to keep the Gummies' existence a secret.