Little Dolphin and his friends in Urchin Bay always have fun and adventures together, in their underwater world. There's a big storm coming, and Little Dolphin is excited! He's off to play with his friends Milo and Poppy. When Cornelius, the grumpy conger eel, tells them off for making too much noise near his lair, they head off to play hide and seek in the old wreck. But Milo gets trapped in the wreck - can Little Dolphin save the day?