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DC Jun 1958

Action Comics #241

Action Comics #241
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Introduction of the Fortress of Solitude
A prototype version of Superman's headquarters was introduced in Superman #17 and the name was mentioned in Superman #58
DC Jul 1958

Action Comics #242

Action Comics #242
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1st appearance and origin of Brainiac
1st appearance of the Bottle City of Kandor, the capital city of Krypton
[December 2025 - James Gunn posted an Instagram confirming Lars Edinger will portray Brainiac]
DC Mar 1960

Action Comics #262

Action Comics #262
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Introduction of the concept that Kryptonians derive their powers from Earth's yellow sun
Introduction of the concept that Kryptonians are as powerful as ordinary humans under their native planet's red sun
DC Aug 1960

Action Comics #267

Action Comics #267
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3rd appearance of the Legion of Super-Heroes
First meeting of the Legion and Supergirl
1st appearance of Chameleon Boy
1st appearance of Invisible Kid
1st appearance of Colossal Boy
DC Apr 1961

Action Comics #275

Action Comics #275
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First mention of Superman's Heat Vision power - previous issues demonstrated his X-Ray vision having powers to melt glaciers
Debut of Red/Green Kryptonite - causes mutations including an extra eye on the back of Superman's head
DC May 1961

Action Comics #276

Action Comics #276
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1st appearance of Sun Boy, a solar-powered member of the Legion of Super-Heroes
1st appearance of Phantom Girl, a member of the Legion of Super-Heroes who has the ability to phase through objects
1st appearance of Triplicate Girl, a member of the Legion of Super-Heroes who can split into three identical bodies
1st appearance of Bouncing Boy, a density-changing member of the Legion of Super-Heroes
1st appearance of Shrinking Violet, a member of the Legion of Super-Heroes who can shrink to sub-atomic size
1st appearance of Braniac 5, a genius and time-traveling member of the Legion of Super-Heroes
Supergirl joins the Legion of Super-Heroes
DC Apr 1962

Action Comics #289

Action Comics #289
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1st appearance of Luma Lunai, an alien woman whose powers would not function under the yellow sun of Earth
In the story where Supergirl attempts to find a wife for Superman, he discloses to here that he would marry her if Earth's laws allowed cousins to be wed - tap cover and swipe to view panel

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