Petra is one of the Big Harbor's two pilot boats who patrol the harbor and sometimes help the tugs with moving ship to their docks. They both used to have a problem with not listening to the tugboats, which caused a lot of confusion.
Petra was the second pilot boat to come to the harbour and has a closer relationship with the tugboats. She was shy at first about coming to the Big Harbor until Theodore introduced her to everyone. She also enjoys playing "hide and surprise" with Theodore and Barrington on occassion.
Both Petra and Pearl are hard working and work together with the tugs to keep the harbour running properly.
- Petra is the youngest of the two.
- Petra's model was sold on ebay.