Bully is havng a daydream. Lying contentedly on his raft by the beach, drifting lazily out to sea, Bully wonders why all the fish around him are such boring drab colours, all brown and grey - when they could be bright green and yellow. But then suddenly Bully's raft hits a terrible whirlpool, and down he's sucked, further toward the ocean bed. Before he knows it, Bully finds himself caught in an underwater cave, where he meets an ancient sea sprite. The Sprite has been there for many years, held captive by a ghostly sea monster, all because the sprite wanted to paint all the fish in the ocean brighter colours. He must escape and carry out his mission, and Bully must help. But first they must get past the big, scary sea monster! Will Bully and the sprite escape to make a brighter world?