Atlantis: The Lost Continent (2003)

Fisherman's son Rodrigo finds on the beach a very special letter in a bottle. With the help from his Grandfather they quickly discover that it tells them how to find "The Lost City of Atlantis". "People have been searching for Atlantis for centuries without any success", said Grandfather excitedly. Rodrigo, his dog Uzo and his Grandfather set off to find the lost city...