The Reeftown Rangers wonder where the end of the ocean is, or if the ocean even has an end. They venture out to find the end of the ocean and discover a rainbow salmon, Sal, who teaches them about the difference between fresh water and seawater, and about where all the water goes beyond the ocean. / Splash, Bubbles, Dunk and Ripple travel to the Antarctic and meet a new friend, Dive, a gentoo penguin who can live in and out of the water. Dive wants to be a Reeftown Ranger, but needs to learn that he is not just like a fish!