The submarine Neptune is missing. When Willy learns about this he sets out, with Randolph, his pompous little teddy bear, to save the submarine from the clutches of Konrad the Killer Kipper.
When the world’s largest submarine, The Neptune is lost somewhere at the bottom of the Atlantic Ocean, Willy and Randolph the Bear must save all the trapped sailors – with some help from the Rightaway Bird, Sybil Seagull, and Boris the Blue Whale. Which means defeating Konrad the Killer Kipper and his gang of a hundred horrible herrings who have captured The Neptune because he wants to eat the sailors. Can Willy and his friends win against them?