The situation cannot continue like this. Tentaclus won't stop bothering Fairies, Shellies and Mermaids. Together, they think of the perfect plan using some special algae to put an end to this problem. This is their last chance to stop Tentaclus and bring the Sea World back to normality, but... where is he? He is not in his hiding place and no one has seen him all day... Will they finally retrieve the two pearls, and will everything go back to normal once and for all?