Comic Title: Superman #131
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: August 1959
On Sale Date: June 18, 1959 Newsstand Date June 18, 1959
Source: House Ad, Action Comics #255, Page 23

Copyright Date June 18, 1959
Source: Library of Congress, Periodicals 1959

Frequency: Monthly, with the exception of March, June, September and December
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "The Menace of Mr. Mxyzptlk"
Pages: 9

Feature(s):
Superman (of Earth-1)

Writer: Jerry Coleman
Artist: Al Plastino

Reprinted In:
Superman #206 (1968)
Showcase Presents Superman Vol. 1 TPB (2005)
Superman:The Man of Tomorrow Archives Vol. 2 HC (2006)

Feature Character(s)

• Superman (last appearance in World's Finest Comics #103; next appearance in Superman #131)

Supporting Character(s)

• Lois Lane (disguised as a movie star; last appearance in Action Comics #255; next appearance in Superman #131)
• Perry White (last appearance in Action Comics #254; next appearance in Superman's Girl Friend, Lois Lane #11)

Villain(s)

• Mr. Mxyzptlk (first Earth-1 appearance; last appearance in Adventure Comics #351; next appearance in Superman #135)

Synopsis:
Mr. Mxyzptlk returns from the 5th dimension to play tricks on Superman. Superman tries to send Mxyzptlk back home by making him say his name backwards. This time however, the imp has an alarm, that warns him when he is about to say his name backwards.

Superman gets Mxyzptlk to remove his hat, where the alarm is stored. However, when Superman and Lois Lane trick him into saying Kltpzyxm, Mxyzptlk’s head cold prevents makes him lose his voice. Finally Superman gets the imp to watch a newsreel of his previous antics. The newsreel is played backwards so that the word Kltpzyxm is spoken. The vibrations of his own voice, even though it was recorded, send the imp home for 90 days.