The story starts with Captain Star giving an introduction to the Bigg City Port, and the Star Fleet. During the briefing, he informs his tugs that a small harbour switcher called Sunshine from upriver is coming to help the fleet. He also announces that they are to tow in the Duchess, a grand ocean liner into Bigg City Port. After a brief introduction to the Z-Stacks by Captain Star, Captain Zero tells his Z-Stacks that they must form a plan to snag the contract for themselves. Hercules (the larg