Captain Longstocking docks in the village to pick up Pippi and take her with him to the South Seas. Annika and Tommy are given permission to go along and they all set sail for adventure on the high seas. Pippi teaches the Settergren's about life on board, teaching them to be look-outs and how to manage a pirate attack. Unbeknownst to the Captain and crew, Thunder Karlson and Bloom are castaways yet again in search of their fortunes. Unfortunately, they get very sea sick and the fortune is not as easy to access as they had hoped.