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Green Kryptonite was the primary variety of Kryptonite. It was a radioactive element composed of pieces of the exploded planet Krypton. Surviving natives of Krypton, such as Superman and Supergirl, or their descendants were weakened by exposure to Green Kryptonite. Prolonged ex

History

Green Kryptonite was the primary variety of Kryptonite. It was a radioactive element composed of pieces of the exploded planet Krypton.[1] Surviving natives of Krypton, such as Superman and Supergirl, or their descendants were weakened by exposure to Green Kryptonite. Prolonged exposure could result in fatal radiation poisoning.[2]

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Notes

  • Kryptonite was first created for an unpublished 1940 comic book story, in which it was called "K-Metal".[3] Kryptonite made its actual debut in a 1943 episode of the The Adventures of Superman radio series. In 1949's Superman #61, Kryptonite made its DC Comics debut, colored red but with the properties commonly associated with Green K and not the unpredictable effects of Red Kryptonite. Reprints of this story have recolored the Kryptonian mineral as green. Green K in its commonly recognized form finally made its comics debut in 1951's Action Comics #161.


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