Mr. Mallet returns to the surface world, carrying the small, glowing object that the Aquarians had given him. He is determined to protect their world and its inhabitants from any harm that may come their way. He spends months researching and developing new technologies that can help him keep an eye on the ocean and detect any threats to the Aquarian world.

One day, his device alerts him of an incoming threat. A group of pirates is sailing towards the Aquarian world, armed with weapons and a plan to steal the crystal that powers their world. Mr. Mallet springs into action and heads towards the ocean, ready to defend his new home.