The story is about two swindlers who get their hands on a map to the fabled city of gold, El Dorado while pulling off some sort of scam. Their plan goes bad and the rogues end up lost at sea after a number of misfortunes. Oddly enough, they end up on the shores of El Dorado and are worshiped by the natives for their foreign appearance.

The sea underworld is shaken up when the son of the shark mob boss is found dead and a young fish named Oscar is found at the scene. Being a bottom feeder, Oscar takes advantage of the situation and makes himself look like he killed the finned mobster. Oscar soon comes to realize that his claim may have serious consequences.