Dolphin Snowball rescues a little boy in the waves who survived a plane crash. Since then, friends, almost brothers, carelessly grow up together, exciting the marine life with their funny tricks. Until one day the peace of their joyful little world is destroyed by the evil Octopus. He banishes the boy to land, where he will have to learn to live among people and understand the secret of his origin. A new friend, the kind captain Murvarid, and the faithful Snowball will help the boy cope with all the hardships - whether at the bottom of the sea or on mysterious distant islands. Fabulous adventures await.