Old Blu was once the brightest fish in the sea. But as time passed, his color began to fade away. Everyone tries to help Blu be his old self again: the cleaner fishes clean him, the nurse fishes nurse him and the eels bring him nutritious food to eat. But nothing seems to work until a fish named "Puffer" tries a new approach. "Blu" is a commentary on the importance of happiness on on one's emotional, as well as physical, well-being.