The sea is't just Sydney's playground -- it's his home! But sadly it's becoming a giant landfill. Plastic bags bob like jellyfish, animals get stuck in nets, a litter piles up from shore-to-shore. As Sydney and his friend Roberta set out to clean the sea, their mission grows bigger. Can these two small seals show one big world just how much danger their beloved waters face? And will people pitch in to help before it's too late?