Captain 0 is the devious and scheming owner of the Z-Stacks. He is known to have criminal connections and was originally affiliated with Johnny Cuba before something happened between the two. He is known to be quite temperamental.
In Sunshine, he is determined to sabotage the Star Tugs' ocean liner contract, and so Zorran carries out the plans. Thinking no-one has seen him push Sunshine into the Duchess, Zorran and the others tell the captain and he congratulates Zorran and Zak. Soon, the truth is out, and he yells at four of his tugs for failing to snag the contract.
If there was a 2nd season, more of his personality would probably have been exposed, although it is suspected he is an evil character.
Although the accidents caused by his fleet are mainly their fault, Captain Zero has also been known to be cause of their accidents. In some cases, his ordering his tugs not to help the Star Tugs prevent Zip and Zug from helping the Star Tugs rescue Izzy Gomez, causing them to lose the Rock Contract. Also, Zebedee and Zak taking the shortcut without thinking about the high tide, may have been because Captain Zero didn't tell them about the tide.
Whenever he speaks to his tugs, the captain's megaphone sways violently as he speaks, which could be due to his temper. He has a yellow and black striped megaphone, that can be seen out of the run-down, wooden dock-building that he works in (The Zero Dock). He cares not for his tugs, but forces them into working hard and reliably. His favourite is assumed Zorran, as he is #1, follows his orders precisely, and is the smartest and most devious of the Z-Stacks. This is why Zorran is usually in charge of the Z-Stacks and their operations during certain tasks, such as is Munitions, where a delivery of explosives were to be towed across the port to Big Mickey.
- Captain Zero's final speaking role was in Pirate, but his last full appearance was in Jinxed. He was also meant to have a speaking role in High Winds, but it was cut from the same episode.
- It is unknown why Captain Zero had less speaking roles than his crew, despite him being the leader of his fleet.