What can a lively sea creature do with a piece of trash thrown into the ocean? With a little imagination, quite a lot! When a friend wishes for a treasure too, the heroes head off on an adventure through dark trenches and past haunted shipwrecks, sometimes swimming for their lives. Follow their journeys as these friends explore coral reefs and sunlight shimmering on water, yellow rivers with snapping crocodiles and cold ocean depths, and cheer on our heroes with a resounding Go, Fish!