The MeteoHeroes Rock Band are practicing the song they’re going to perform at an upcoming Earth Day celebration. But they’re playing so loudly, they don’t even hear when the ALARM goes off. Peeguu has to pull the plug on their amplifiers before they hear it... They transform and assemble in the Operations Center as fast as they can! A ship in the Japan Sea is searching the seabed with a powerful sonar, probably to locate an ocean-bottom gas pipeline... But the sonar’s sound waves have caused a pod of dolphins to become disoriented and completely lose their way! The MeteoHeroes must help them and eliminate the source of the harmful sounds. Fulmen and Nubess are given the mission. They quickly discover that the sonar ship causing the problem belongs to Dr.Makina. He wants the gas pipeline to use for the unlimited energy his ongoing epic house party requires. Nubess creates a fog bank to keep the dolphins focused on her as she leads them to safety... but the sonar ship use the cover of the fog to go into stealth mode, making it imposisble for Fulmen to find it! Ventum is sent to back him up and together they locate the ship and completely defeat the Maculans running it. Dr.M’s ship won’t be harming any more dolphins! Mission accomplished!