Comic Title: Action Comics #294
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1962
On Sale Date: September 27, 1962 Newsstand Date September 27, 1962
Source: House Ad, Superman #157, Page 20

Copyright Date September 27, 1962
Source: Library of Congress, Periodicals 1962

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "The Kryptonite Killer"
Pages: 14

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

Writer: Edmond Hamilton
Artist: Al Plastino

Reprinted In:
Showcase Presents Superman Vol. 4 TPB (2008)

Feature Character(s)

• Superman (last appearance in Superman #157; next appearance in Action Comics #294)

Villain(s)

• Lex Luthor (last appearance in Action Comics #292; next appearance in World's Finest Comics #129)
• Diamond Man, Lead Man, and Kryptonite Man (androids creations of Luthor; destroyed in this story; no further appearances)

Other Character(s)

• The robot citizens of Roxar (#4306 named; last appearance in Action Comics #292; no further appearances)
• Various android servants (last appearance in Action Comics #292; no further appearances)

Cameo Appearance(s)

• Saturn Queen (a statue in the Fortress of Solitude)
• Mr. Mxyzptlk (a statue in the Fortress of Solitude)
• Jax-Ur (a statue in the Fortress of Solitude)
• Brainiac (a statue in the Fortress of Solitude)

Synopsis:
Lex Luthor using his scientific genius to build inventions on the planet Roxar where he has been trapped. Using the inventions, he is able to create three android men, Diamond Man, Lead Man, and Kryptonite Man. With the help of the androids, Luthor is able to rob the robot citizens of Roxar of their radium supplies and power his rocket to escape their world.

Luthor then begins an intergalactic piracy spree, which brings his escape to the attention of Superman. When Superman finds and confronts his arch-nemesis, Luthor turns Kryptonite Man loose on the Man of Steel. Lead Man, having seen Luthor as evil, sacrifices himself to save Superman from the Kryptonite Killer. Superman then brings Luthor back to Earth, where he is placed in the psychiatric ward of prison, apparently having lost his mind.