Comic Title: Superboy #131
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: July 1966
On Sale Date: May 17, 1966 Newsstand Date May 17, 1966
Source: Direct Currents, Adventure Comics #345, Page 11

Copyright Date May 17, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Monthly, with the exception of Feb, Aug., and Nov.
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "Lex Luthor, Imp"
Pages: 8

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

Writer: E. Nelson Bridwell
Artist: George Papp

Reprinted In:
Best of DC #7 (1980)

Feature Character(s)

• Superboy (last appearance in Superboy #130; next appearance in Superboy #131)

Villain(s)

• Lex Luthor (last appearance in Superboy #121; next appearance in Superboy #159)
• Mr. Mxyzptlk (last appearance in Superboy #120; next appearance in Adventure Comics #351)

Comments:
Mxyzptlk is referred to as "Master" Mxyzptlk in this story.

Synopsis:
Mxyzptlk returns to Earth to plague Superboy. Lex Luthor seizes the opportunity and builds a machine to siphon off Mxyzptlk's powers and give them to himself. Angry that he was upstaged, Mxyzptlk starts a battle with Luthor with Superboy caught in the middle.

Superboy tricks Mxyzptlk into saying his name backwards, sending the imp home to Zrfff. Luthor retains his powers though. Superboy tries the same trick on Lex, but even when he says his name backwards, Lex's powers don't disappear. Superboy then examines the machine that gave Lex his power. After completing his analysis, Superboy finds a way to remove Lex's powers using a coded set of numbers which represent Lex's name.