Quien tiene un amigo… tiene un tesoro

Alan (Terence Hill), a perpetual gambler at the horse races, has to escape from Frisco Joe's gang, whose fifteen thousand dollars he stole and lost… by betting on the wrong winning horse. On the run, Alan sneaks aboard the small boat of Charlie (Bud Spencer), a lone sailor who makes voyages advertising Puffin Marmalade. Alan carries a map of a certain island where his uncle Brandy, who is suffering from meningitis, claims a great treasure is hidden. Upon arriving at Pongo-Pongo Island, where according to his uncle Brandy the treasure lies, Alan and Charlie face a host of adventures, since the spot marked on the map is an old military port guarded by Kamasuka, a Japanese soldier who still hasn't realized World War II is over.