You were never my friend! You are ready to destroy anything in your path! I saw that when you sacrificed Diamond Man who was once my android brother... Now I willingly give my life to halt your evil plans, Luthor!" 
- — Lead Man
Action Comics #294 is an issue of the series Action Comics (Volume 1) with a cover date of November, 1962.
Synopsis for Superman: "The Kryptonite Killer!"
Lex Luthor performs a boon for the Automs, and is rewarded with a laboratory of his own. In it, he fashions three criminal Androids into a Diamond Man, a Leadman, and a Kryptonite Man. With their help, he steals all of the Automs Radium and manages to return to his rocket and escapes with all three of them.
The foursome begin a spree of space piracy. Superman intervenes and destroys the Diamond Man, but the triple-strength rays of the Kryptonite Man are too much for Superman. Lead Man is infuriated by Luthor's callous destruction of his friend and melts itself over the Kryptonite Man, neutralizing his deadly radiation. Superman captures Luthor and returns him to prison on Earth.
Appearing in Superman: "The Kryptonite Killer!"
Featured Characters:
Antagonists:
- Luthor
- Superman's Hall of Enemies
- Brainiac (Statue only)
- Jax-Ur (Statue only)
- Lex Luthor (Statue only)
- Mister Mxyzptlk (Statue only)
- Saturn Woman (Statue only)
- Lightning Lord (Mentioned only)
Other Characters:
- Android Slaves
- Diamond Man (Single appearance)
- Lead Man (Single appearance)
- Kryptonite Man (Single appearance)
- Automs
- Number 43061
- Number 2080
Locations:
- Axon IV Nebula (Mentioned only)
- Bruno VI Star Cluster (On a TV or computer screen)
- Galaxy Procyon (On a TV or computer screen)
- Planet Cyberna (On a TV or computer screen)
- Roxar
- Freeze Pits
- Pyramid Vault
Items:
- Cosmic Clock
- Dynos (Giant Robovorous Insects)
- Flame Jewels
- Luthor's Weaponry
- Brain Pattern Analyser
- Converter Machine
- Deactivator Beam
- Frost Ray Projector
- Heat Gun
- Repeller Ray
- Periodic Table Samples
- Copper
- Gold
- Green Kryptonite
- Lead
- Zinc
- Permium
- Radium
- Rainbow Cloth
- Superman Robot (Flashback only) (Destroyed)
- Superman Statue (Destroyed)
Vehicles:
- Luthor's Rocket
Synopsis for Supergirl: "The Mutiny of Super-Horse!"
Supergirl helps Comet with his first picture, in which he co-stars with actress Liz Gaynor. However, after he eats a variety of lotus flowers which induce amnesia, Comet forgets his old identity, Supergirl, and his super-powers. He becomes the "pet" of Liz Gaynor, and Linda Danvers wonders tearfully if she'll ever see her old horse again as a friend.
Appearing in Supergirl: "The Mutiny of Super-Horse!"
Featured Characters:
- Supergirl (Flashback and main story)
Supporting Characters:
- Comet (Flashback and main story)
- Edna Danvers
- Fred Danvers
- Liz Gaynor
- Superman
Antagonists:
- Maldor (Mentioned only)
Other Characters:
- Circe (Flashback only)
- Ulysses (Mentioned only)
- Venusians (Mentioned only)
- Ape-Men (Mentioned only)
- Queen of Venus (Mentioned only)
- Von Lutz
- Matt Carver
- Mace Greede
Locations:
- East Africa
- Jungle Island
- Fortress of Solitude
- Greece (Flashback only)
- Aeaea (Flashback only)
- Krypton (Mentioned only)
- Land of the Lotus Eaters (Flashback only)
- Planet Venus (Mentioned only)
- United States of America
Items:
Vehicles:
- Cable-Car
- Kryptonian Rocket (Flashback only)
Trivia
- A nine-year old Steven Grant has a letter published in this issue, pointing out what he thought was a continuity error. Grant is a comic writer; known for working at Marvel and independents before writing extensively at DC; covering many books such as Deathstroke the Terminator Vol 1; Manhunter Vol 2 and Challengers of the Unknown Vol 3.
See Also