By happy coincidence, the Sea Rat meets up with another pirate ship, the Bone Rattler. The Bone Rattler isn't any old pirate ship, either - it's the ship Aaron and Vicky sailed on before coming to Pirate School! Captain Stinky Beard decides to let the kids sail off with the Bone Rattler for a few days to test their pirating skills and search for treasure. But when the ship gets stuck in dangerous Shipwreck Pass, it's up to the pirate kids to save the day.