Metallo
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Metallo is the name of several supervillains appearing in American comic books published by DC Comics, commonly as an adversary of Superman. All versions of the character are powered by kryptonite and
The George Grant version of Metallo as seen on the cover of Superman Family #217 (April 1982). Artwork by Rich Buckler (pencils) and Dick Giordano (inks).
Brian Austin Green as John Corben as depicted in Smallville.
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