Freddie Fernortner, Fearless First Grader has a new wading pool! But it's not just any wading pool: it's magical! When Freddie, Darla, and Chipper fill it with water, it looks just like a normal pool... but that's about to change. Soon, the three pals, along with Freddie's Cat, Mr. Chewy, are going to find themselves in an undersea world that is far from ordinary! Put on your swimsuit, and get set to join Freddie and his friends on a magical underwater adventure filled with thrills and surprises!