In most universes throughout the Multiverse, each planet Krypton faced a simiilar eventuality... its eventual destruction. While some would survive, a scant few, perhaps the most immense testimony to this dying world are these meteors formed from its exploding mass. Hazardous to any superpowered Kryptonian, aside from Earth-Thtree's Ultraman for whom it has the opposite effect, every Superman finds this mineral to be his Achille's heal. Originally mentioned iu an unpublished non-canonical tale when it was known as K-Metal, it was first referred to when Earth-Two's Superman faced the wicked Scarlet Widow and later Atoman who possessed this deadly element, although not in it recognized form. On Earth-One, it was a continual feature in Superman's mythos since his days as the Superboy of Smallville, utlized by various foes throughout the years. However, the typical manifestation of this radioactive rock as green Kryptonite was only the tip of the proverbial iceburg, as other variations including red, gold, blue, white and others would reveal themselves over time. Each with their own destinct effects we'll dissect.
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