Carl was a stuntman. He dressed up as the Ape Man because he was mad about not getting the main part in a movie, so tried to sabotage the set. He was undone by Shaggy Rogers, who with a Polaroid camera, managed to take a picture showing Carl in a mirror without his mask. Carl also briefly impersonated Scooby-Doo by wearing a mask of him when confronting the real Scooby at a phony mirror. 
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