On-sale date from promo in Action Comics # 271
published in cooperation with the National Social Welfare Assembly
Letters submitted by William Cassity; Carman Tisdel; Anne Zeek; Don Farb; Terry Fielden; Linda Rocawich
Mort incorrectly explains that Mxyzptlk is pronounced "Mix-Yez-Pitel-Ick".
This misinformation is corrected in a later letters page where it is stated that Mxyzptlk only has three syllables.