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Issues
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1st appearance of Streaky the Supercat
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
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
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
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
1st appearance of Lesla-Lar, a Kryptonian who escaped from the bottled city of Kandor
Supergirl is introduced to the world
Classic cover art by Curt Swan
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
First meeting of Supergirl and Mr. Mxyzptlk
Milestone issue Action Comics issue #300
1st appearance of the Black Flame, Zora Vi-Lar, a criminal from Krypton
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- Variant Covers ([[totalVariants]])