13 Bigg Freeze

Every winter the big liner Vienna would come to Bigg City Port to pick up supplies and refuel. This year however, the harbour was frozen over, so the Tugs had to take supplies out as far as Lillie the Lightship, as this was as near as a big ship like Vienna could get to the harbour. Problems begin when Lillie the Lightship runs out of fuel and things start to get worse when the Z-Stacks show up.