Flinn is at school looking in the art cupboard for some colored pens to finish off his dinosaur drawing when he stumbles upon Captain Stubble a real live Pirate Captain! He tells Flinn that his ship the Acorn has been stolen & that he needs Flinn to help him rescue it back. Stubble makes Flinn the captain & they sail away on an old pirate ship & they finally find the Acorn but to their horror realize its been stolen by Pirate dinosaurs! Captain Flinn & his crew attack the dinosaurs & after much fighting seize control of the ship once more. Flinn & his friends then sail back to the harbor clambering through the boatshed door & back into the art cupboard without the teacher even noticing theyve been gone!