The French bunny Jean-Pierre has tracked down Mike and Alex and brings them to the Normandy coast, where the Allied invasion of German-occupied Europe took place in August 1944. A dolphin family is waiting there to take our heroes to Wally. This whale managed to escape the whalers with a harpoon in its back. Of course, Mike and Alex, with the help of many dolphins and a selection of special seaweeds, manage to heal the whale. Wally is so grateful for this that he invites the land animals on a world cruise by whale. The luxury on board the whale can hardly be described. In part 4, which follows this story, it turns out that it will not be a cruise of lazing around, but of meeting some major needs of the sea animals.