Angela and Old Tom go to the beach, where Old Tom gets involved in a sandcastle competition. While waiting for his sandcastle to be judged, Old Tom goes swimming and meets a baby whale, and plays with him underwater. Meanwhile, on shore, Billy pretends Old Tom's sandcastle is his own, so he can win the competition. With the judging about to begin, Old Tom races back to shore, but accidentally smashes his own sandcastle. However, with the help of the whale, he ends up winning the competition, after all.