Green Kryptonite
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Real Identity: Not Applicable
Appearances: Battle of the Superheroes! and Triumvirate of Terror!
Powers/Skills: Radioactivity and Photosynthetic Interference
Voiced By: Not Applicable
Green Kryptonite are meteorites that were once made up the planet Krypton. After the planet's unstable core could no longer handle a growing radiation, it exploded. Several shards of the planet were caught in the acceleration one lifeboat that escaped to Earth. It was studied and concluded to be a transuranic element with an atomic number of 126. Decades later, it is discovered this element can be used against Superman.
Superman's Kryptonian physiology absorbs yellow sun electromagnetic radiation and gifts him with the range of super powers. The Green Kryptonite emits its own radioactivity that interferes with Superman's solar absorption and painfully forces the energy out of him. As a result, Green Kryptonite causes extreme pain, loss of powers and even death with prolonged exposure. Chemically it is found to contain 10.62% Dialium, 3.94% Mercury, 15.08% Plutonium, 24.02% Promethium, 18.06% Tantalum, 27.71% Xenon, and 0.57% of a previously unknown element. The object is used by several of Superman's enemies. Metallo uses a chunk as a power source and Lex Luthor forged some from his collection into a ring. A chunk of Green Kryptonite is hidden in the Hall of Doom as a precautionary.