Fed up with Gummi Bear stories by Sir Garwin, a retired knight and Cavin's grandfather, a citizen of Dunwyn issues a challenge to him: Find evidence of the Bears' existence, or give up his fortune. Cavin, of course, is stuck between helping his grandfather and keeping the secret of his friends. Meanwhile, Tummi Gummi is cursed after eating a dangerous fruit and his friends must find a spell to save him.