The captain of a small boat does a deal with some Cuban rebels to move some gold for them. He wants to steal the gold so sets about killing off the Cuban soldiers by pretending they are killed by a sea monster, only to find there really is a sea monster. This is a low budget Roger Corman film, that has a bad plot and acting, but is a send up of various genres of film. From creature features to the captain being Bogart from The African Queen. This is not the best of Roger Corman and not one to be taken seriously.