A baby princess named Ocean is sent away from the North Pole by her mother to escape the tyranny of the magma dragon that rules the volcano. For the next twelve years, she lives on a nearby island where she encounters a polar bear that can transform, whom she names Roly Poly. She also befriends a pair of little fish. While confronting pirates, she meets an inventor named Momo, and together they plan to subdue and defeat the magma dragon.