In the Elseworlds story JLA: The Nail, Congo Bill (in his Congorilla form) makes an appearance in Professor Hamilton's Cadmus Labs.
Pep Morgan, Congo Bill (later Congorilla) and Clip Carson were the first features he worked on for Action Comics.
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Best known as one of the principal artists on the long-running Superboy feature for DC Comics, Papp also co-created the Green Arrow character with Mort Weisinger and co-created Congorilla along with writer Whitney Ellsworth.