Little Dolphin and his friends in Urchin Bay always have fun and adventures together in their underwater world. Little Dolphin and his friend Milo are learning to jump! But Little Dolphin just can't manage it. And soon they have more important things on their mind - Vinnie the shark has persuaded Hattie to swap her old shell for a new one, and it's much too small! Little Dolphin and Milo come splashing to the rescue ...