Basil Wolverton and Wallace Wood provided covers for the first 19 issues, each depicting a freakish character of some kind. The cover borders hosting a plethora of creatures, however, were drawn by Sergio Aragonés. All three artists worked on "MAD", and the logo of "Plop!" is reminiscent of the early logo of that magazine. Wolverton's covers were not drawn for "Plop!"; they were inventory pieces which he sent to DC Comics as a general submission. When all of the drawings he submitted were found suitable for use in "Plop!", Wolverton briefly came out of retirement so that he could continue drawing covers for the magazine. After he had a stroke, the magazine turned to Wood as the new cover artist.