Action Comics #259

Superman - The Revenge of Luthor!Who is th most powerful man on Earth? Superman! And who was the most powerful boy on Earth? Superboy! Of course, Superboy grew up to become Superman, but the Man of Steel's feats as a youth will never be forgotten, but wait! There's no need to rely on memory... For suddenly Superboy exists again, living at the same time Superman does! And this amazing situation inspires -- The Revenge of Luthor!Congorilla - The One-Ape Circus!It was inevitable that Congorilla's reputation would spread to the world beyond the jungle! But when the amazing man-ape enters the big cities of civilization to display his famed skills, the results are unexpectedly shocking! A super-surprise awaits you when Congorilla becomes... The One-Ape Circus!Supergirl - The Cave-Girl of...