Life peacefully passes by in Sunnytown until Mitcho and Sebastian find a message in a bottle by the harbor. The Bottle is from the missing Mayor of Sunnytown with a message that he is on The Mysterious Island and has made a great discovery. They must embark on a great journey to help save the Mayor and bring him home; in the process they uncover something that will bring great pleasure to the city of Sunnytown – a Giant Pear.