Esteban has finally earned his stripes as ship's harpooner after having saved the crew from the wrath of a huge blue whale. But now their hunting ground is jeopardized by a steam boat that's just shown up in the area. Faster and better equipped with explosive harpoons, these more modern ships massacre hoards of whales to extract only the part that sells for the highest price. In a madcap plan to neutralize their unfair competition, the captain of Esteban's ship slips aboard the steamer to try and sabotage its engine. However, he's not as gifted a mechanic as he might think, and it's not long before the crew of the Leviathan have to haul anchor and set sail...