When the sea fairy promises him a new ship in return for retrieving a stolen magic sapphire, Pirate Pete discovers that the gem is guarded by a fierce, but dimwitted, giant.
A sea fairy promises Pirate Pete a new ship if he will go to Thunder Island, retrieve the stolen Sea-Fairy Sapphire, and throw it into the sea, but he nearly flubs the deal when he cannot resist using a little bit of the gemstone's magic.