Issues were hosted by three ghoulish characters with biblical names: Cain, Abel, and Eve. An issue would typically contain a story told by each of the characters, each bidding to outdo the others in fiendishness.
An illustrative tale involved a gourmet diner whose love for frogs' legs leads to a predictable amphibian revenge: he is left without lower limbs and is doomed to negotiate the world on a trolley.
Basil Wolverton and Wallace Wood provided distinctive covers for the first 19 issues, each depicting a freakish character of some kind.
more on wikipediaall 24 covers: link
read first issue of Plop: link