Kryptonite
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Real Identity: Not Applicable
Appearances: Play Date, Field Trip, Inside Job, Battle for the Bottled City, The Fatal Fare, Best Day Ever, Superman's Pal, Sid Sharp, Superman Red vs. Superman Blue, and Harley Goes Ape!
Appearances (Webisodes): Beep Beep, It's a Trap!, and True Colors
Powers/Skills: Radiation
Voiced By: Not Applicable
Kryptonite are irradiated remains of Superman's home planet Krypton that have landed on Earth. Green Kryptonite leaves Superman powerless in a weakened state. It was discovered lead had certain properties that could block its radiation. Superman keeps a suit made of lead in his aresnal. He has confiscated many pieces of Kryptonite and keeps them in storage in a room at the Fortress of Solitude. Toyman developed toy called Star Sparkle Super Putty which was really Kryptonite. After he broke into the Watchtower, he launched the putty shell at Superman. It burst open and the Kryptonite wrapped around Superman, leaving him powerless. While being forced to fight in Toyman's "Blvd Brawlers 2 JLA" video game, Superman was dismayed after he learned Batman kept a Kryptonite ring in his utility belt. Once Cyborg had Batman's Super Meter charged, he activated the Kryptonite Ring Punch move. Batman knocked out Superman and won the match. Lobo has a Kryptonite Ray Gun and Kryptonite Cage in his arsenal.
Blue Beetle, Firestorm, and Stargirl attempted to neutralize Zod, Faora, and Quex-Ul with one of Superman's Kryptonite samples but it was too small. Firestorm found the sample amid the rubble from the battle and focused on studying its atomic structure in order to add it to his arsenal. Firestorm was overwhelmed by the information but Professor Stein guided him towards concentrating. Firestorm rejoined the battle in time and generated Kryptonite from his hands to defeat Zod, Faora and Quex-Ul before they killed Stargirl and Blue Beetle. Firestorm bound them in Kryptonite chains but absorbed the energy flowing towards Superman to keep him unaffected. For the mission to destroy the nanobots infecting Superman, the Atom outfitted a laser sword with just enough Kryptonite to cut through Superman's nose hairs and other potential obstacles. He put it to use to hack the nanobots as well. Luthor surmised the Atom was helping save Superman and breached the Watchtower. He bathed Superman in Kryptonite rays but the Atom intervened and ran off with the gun.
The Atom used a sliver of Kryptonite with his white dwarf technology to shrink Superman so he could journey into the Bottled City of Kandor to meet his people for the first time and collect tissue samples. Lex Luthor set a trap for Superman using his extensive knowledge of his rival. He disguised a mannequin as a woman he pretended to kidnap named Brie Gruyere. The mannequin was outfitted to spray Kryptonite gas. Luthor would apply the finishing blow with a baseball bat modified with a Kryptonite tip. Amid a failed invasion of Earth, Kanto blasted Superman with a Kryptonite ray. After the battleships crashed on the Third Moon of Graxos IV, Superman was placed in a containment tube. Using a chunk of Kryptonite as a power source, Desaad raised a field around Superman and attempted to torture the solution to their downed Boom Tube network out of him. Space Cabbie's Jack later extracted the Kryptonite and placed it in its chest cavity. The field dropped and Superman joined the battle.
In the finale of Joker's best day ever plan, Luthor produced a hidden case from a floor compartment and took a canister holding a large shard of Kryptonite. Superman immediately fell. Joker took the bait. Luthor instructed him to keep the other Leaguers busy while he took care of the biggest threat. Joker agreed then was knocked out after Luthor hit him in the head with the canister. Luthor placed it back in the case and handed it over to Batman as part of his surrender. Desaad sent Parademons to the Daily Planet to capture Superman. A Parademon crossed two sticks of Kryptonite together and it detonated. Clark Kent and Sid Sharp were tossed into a shelf in the janitor's closet by the pulse. Kalibak, Kanto, Desaad, and Granny Goodness ambushed Superman and fired Kryptonite blasts on him. He managed to recover thanks to Sharp running his mouth off and setting Darkseid's elites against each other.
Lex Luthor fashioned a Kryptonite Radiation Emitter to destroy Superman once and for all. He stole a pulse regulator prototype from S.T.A.R. Labs then used its Quantum Battery to intensify his emitter's power. To his surprise, the Kryptonite mutated and split Superman into a red and blue version of himself. One good and one bad. Luthor's surprise continued as he discovered the mutated Kryptonite also worked on humans like Wonder Woman. Batman used the Kryptonite's unique radiation signature to track down Superman and Wonder Woman Red but was split himself. Titano, a chimpanzee, gained numerous powers after the space rocket he was launched in crashed into a Kryptonite meteor. He gained the ability to project Kryptonite beams from his eyes.
Metallo opened his chest receptacle and exposed Superman to his Green Kryptonite power source. Firestorm arrived and attempted to transmutate the Kryptonite into lead. Even though Professor Stein just lectured him on its chemical composition that morning, Firestorm forgot it on account of the lecture being boring and very long. He turned into anger-inducing Red Kryptonite then amnesia-causing Gold then personality splitting Black and lastly Pink that turned Superman into a woman. Firestorm remembered he wrote down the formula on his right arm and pulled his sleeve down. He successfully transmutated the Kryptonite into lead. Metallo went offline and dropped on his back and Superman was restored to normal.