Kryptonite is a fictional material that appears primarily in Superman stories published by DC Comics. In its best-known form, it is a green, crystalline material originating from Superman's home world of …

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Kryptonite is the name given to shards of matter that were cast off from the planet Krypton after its destruction.

The meaning of KRYPTONITE is a substance that causes the comic-book character Superman to become weak when he is exposed to it—often used to describe something likened to kryptonite in …

Aug 11, 2025 · Kryptonite is an irradiated piece of crystal from his homeworld of Krypton, which causes physiological changes to any Kryptonian in close proximity. Like the multiple versions of Superman …

Jul 18, 2025 · Kryptonite is a fictional mineral from Superman’s home planet, Krypton. When Krypton exploded, radioactive fragments of the planet were scattered across space. These remnants, …

Oct 9, 2023 · Kryptonite is a radioactive ore from Superman's home world, Krypton. Kryptonite usually only affects Kryptonians, and it's one of the only things in DC that can weaken Superman enough for …

May 29, 2025 · People would first get to know Kryptonite through the popular Adventures of Superman radio serial, in the 1943 episode, “The Meteor from Krypton.” Six years later, Kryptonite—first colored …

Aug 19, 2025 · Black Kryptonite presents a unique and complex form of Kryptonite, first appearing in the Supergirl television series in 1989. Its primary effect is the ability to split a Kryptonian into two …

Kryptonite was reintroduced in Superman #1 (January 1987) by John Byrne. After locating the Kryptonian birthing matrix, Professor Emmet Vale discovers a glowing green meteorite.