Kryptonite
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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
Green kryptonite as seen in Superman: Secret Origin #1. Art by Gary Frank
Kryptonite poisoning
Action Comics 310
Krypton (comics)
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Krypton is a fictional planet appearing in American comic books published by DC Comics, most commonly appearing or mentioned in stories starring the superhero Superman as the world from which he came.
Kryptonite
…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 Krypton that emits a unique, poisonous radiation that can weaken and even kill Superman and other Kryptonians. Kryptonite radiation can be transmitted through…
Krypton as depicted in The Man of Steel (vol. 2) #1 (May 2018). Art by Joe Prado and Ivan Reis.