[No.] 39 [Title] "The Old Caveman and the Sea" [Original airdate] 14 June 1980 [Synopsis] 
While on vacation in Miami, Captain Caveman and the Teen Angels witness a shark attack. They soon discover that a treasure has been stolen. Captain Caveman and the Teen Angels investigate. A Scottish fisherman tells them that it is unusual for sharks to get that close to shore. They soon discover that the shark is really a robot controlled by the hull cleaners who are really pirates who used it to steal the treasure.