The gang visits the Bahamas on a school trip and when they are beaten up by the island karate champion, Mortalito, they convince Larry to fight him. Although he is without his master Masura’s help, Larry beats the champion. then a con man sells Larry’s friend fake treasure maps and they realize too late that they have been tricked. Larry catches the swindler and turns him over to the police and they all return home a little wiser.