In Bigg City Port there are two tugboat companies - The Star Tugs owned by Captain Star and the Z-Stacks, owned by Captain Zero. The Stars are honest and hardworking but their rivals, the Z-Stacks are not to be trusted and often cause trouble. Warrior, the clumsiest tug in Captain Star's fleet, has managed to cause one disaster after another. But when little tug Ten Cents is involved in an accident with the tramp steamer, Izzy Gomez, it's Warrior's chance to show what he's really worth.