Port, Umi, and their pet crab Jolly Roger, set sail out into the ocean to fix a now broken moon. With the moon broken, an ancient titan named Tiamat is free to wreak the same havoc he once spread, but must replenish lost energy and wait for the final piece of the seal to break. Port, Umi, and Jolly Roger must overcome great obstacles from both the present and past to make things right.