The pirate tugs are a pair of green-eyed tugs who once snuck into Bigg City Port in search of loot.
To increase their security, the pirate tugs used Sea Rogue as their decoy. To make sure that he performed their bidding, they held his uncle for ransom and threatened to sink him if Sea Rogue disobeyed them. With the unexpected help of Zip and Zug, Ten Cents, Sunshine, Grampus, and Sea Rogue were able to capture them and hand them over the authorities.
They are referred to as the "green-eyed things."
Behind The Scenes
The pirate tugs' design may have been inspired by the Mysterons from the Gerry Anderson series Captain Scarlet and the Mysterons, a show which David Mitton had worked on as a trainee special effects technician. Two traits the Mysterons are known for that were adapted into the duo are their booming voices and green eyes.
The pirate tugs are mysterious-looking vessels with black paint and a distinguishable pair of green-tinted spotlights on their bows.