The Octonauts are a crew of cute animals who love to explore the big blue ocean. From their underwater base, the Octopod, the eight intrepid friends are always ready for fun and excitement! When the Octonauts meet a fish with a giant frown on his face, they begin to feel glum too! The Octonauts try everything they can to cheer him up; making music, field trips, miniature golf, and even a baking marathon. Will their new friend ever smile?