The Blue Greens are very similar to humans. However, they live underwater, hidden from curious eyes, deep down in the sea in their small blue city. The Blue Green youngsters, White Nose, Wippus, and Brown Head, spend almost every afternoon together. One day, as they return in the evening from the Red Crab Gorge to the small blue city, they are in for a big shock. The always grumpy wizard Five Beard had a particularly bad day and, in his foul mood, enchanted all the Blue Greens in the small blue city. The three friends are completely at a loss and decide to ask the wise Lexika for help. Since the little Lexika lives outside the city, she, like the three, has been spared from the spell. Lexika discovers that only the good green fairy from Fairyland can free the Blue Greens from the evil spell. They then set off on their journey.