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In page Mad (magazine):

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In 1967, Marvel Comics produced the first of 13 issues of the comic book Not Brand Echh, which parodied the company's own superhero titles as well as other publishers. From 1973 to 1976, DC Comics published the comic Plop!, which featured Mad stalwart Sergio Aragonés and frequent cover art by Basil Wolverton. Another publisher's comic was Trash (1978)[citation needed] featured a blurb on the debut cover reading, "We mess with Mad (p. 21)" and depicted Alfred E. Neuman with a stubbly beard; the fourth and last issue showed two bodybuilders holding up copies of Mud and Crocked with the frowning faces of Neuman and Cracked cover mascot Sylvester P. Smythe.