Hello Kitty meets Star Trek under the sea! Dive in for adventure with these cute new picture book characters. 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! All the shadows in the world have gone missing! The Octonauts ravel to the mysterious Sea of Shade to learn why. Can they convince the great Shade King to return everyone's shadows?