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"It's a rock. A mineral capable of weakening Kryptonian cells."
Bruce Wayne to Alfred Pennyworth[src]

Kryptonite is a glowing green, radioactive mineral from the planet Krypton that was created in the aftermath of the terraformation process of the World Engine in the Indian Ocean during the Black Zero Event. After Superman destroyed the engine, pieces of kryptonite were found in the water. The mineral's properties make it the greatest weakness of Kryptonians, as its radiation is extremely toxic, potentially deadly to them.



World engine Kryptonite

Encased kryptonite from the World Engine site

During the terraforming process of the World Engine and Black Zero in the Indian Ocean and Metropolis respectively, small portions of submerged land were terraformed into large nuggets of green Kryptonite.[2]

Lex Luthor's Experiments[]

During the restoration of the city following the Battle of Metropolis, Lex Luthor discovered a small portion of the xenomineral, fashioned a small splinter into a scalpel blade and used it on the corpse of General Dru-Zod to test its effects on Kryptonians. Satisfied on finally discovering an exploitable physical weakness of Superman, Lex promptly funds missions to explore the World Engine's wreckage, and 18 months after its destruction, the kryptonite nugget (nicknamed "Emerald City" by Lex) was finally found.[3]

Chase for the Kryptonite[]


Lex Luthor examining kryptonite with fascination

Despite Senator Finch placing an embargo on the large kryptonite nugget from the Indian Ocean, Lex managed to ship the xenomineral to Metropolis and enlisted the armed guard of Anatoli Knyazev and his men to transport it to LexCorp Industries. Batman oversaw the shipment from afar and shot a homing beacon at the truck to track it. Later, Batman arrived in the Batmobile to steal the kryptonite nugget, dispatching the guards and chasing after the truck. However, before he could steal the kryptonite, Superman himself arrived and swiftly stopped the Batmobile in its tracks. Afterwards, an undeterred Batman infiltrated the LexCorp building and stole the kryptonite, leaving behind a batarang as a symbol.[3]

Batman's Armament[]

Kryptonite Schematic

Lex Luthor's kryptonite schematics

At the Batcave, Bruce Wayne then used high-powered lasers to cut through the xenomaterial. He thus transmuted the kryptonite into a sharp kryptonite-tipped spear, as well as three grenades of kryptonite-rich gas. During the battle between Batman and Superman, he shoots two gas grenades at the Man of Steel, which temporarily weakened him to human-like levels, allowing the heavily armored Batman to swiftly gain the upper hand. Finally, as Batman was about to impale Superman with his kryptonite spear, Superman and Lois managed to convince Batman to change his mind, and they proceeded to become allies, agreeing to team up against Lex Luthor, the true enemy.[3]

Showdown in Wayne Station[]

Power comes

Superman sacrifices himself to defeat Doomsday with the Kryptonite Spear.

During the battle against Doomsday, Superman retrieved the Kryptonite Spear left behind at the site of the previous battle, struggling to fly against the xenomineral's weakening effects. With a tremendous amount of determination and willpower, he ultimately managed. While Wonder Woman struggled to hold Doomsday at bay with her Lasso of Hestia, Batman fired a kryptonite gas grenade at the monster, managing to momentarily weaken it, thereby giving Superman the opening he needed to charge at Doomsday and deliver the killing blow with the spear, plunging it through the monster's heart. However, the dying monster, in his final moments, managed to loosen the lasso's hold on himself, and impaled Superman with his tremendously sharp and hard bone protrusion, killing the latter as well.[3]

Used by Robert DuBois[]

Sometime after Superman's resurrection, mercenary Robert DuBois, aka Bloodsport, employed forged Kryptonite bullets to use against the Kryptonian, wounding him enough to send him to an intensive care unit, while DuBois was incarcerated at the Belle Reve Correctional Center.[4]

Exhibition at St. Roch Museum[]

A piece of Kryptonite was displayed at the St. Roch Museum during an exhibition of rare minerals that had been known to have fallen to the Earth.[5]

Characteristics and Effect on Kryptonians[]

Getting through to Batman

Superman immensely weakened by Batman's kryptonite gas

"The fragment is of a radioactive xenomineral. We suspected it might have bio-interactions, so we took the sample to AMRIID, where they keep the remains of the Kryptonian decedent. And, when we exposed General Zod to the mineral, this happened. Profound biodegradation. Decaying Kryptonian cells."
"We concluded the mineral could be weaponized if a large enough sample was found."
Emmet Vale and Lex Luthor[src]

The radioactive green kryptonite xenomineral is known to be the greatest weakness of all Kryptonians, since the xenomineral's radiation is extremely toxic, potentially deadly to any of them. It does so by degrading Kryptonian cells, causing them to degenerate and decay on contact. This allowed physical damage to a Kryptonian to be possible, as well as extremely weakening their superpowers and invulnerability to almost human levels. Physical symptoms of exposure are somewhat fever-like, including nausea, weakness, dizziness, vertigo, fatigue, immense amounts of pain, and loss (or near loss) of consciousness.

Wounds inflicted on Kryptonians by kryptonite do not disappear when the xenomineral leaves their presence, and only direct exposure to sunlight can instantly allow a Kryptonian to recover completely from its damaging effects and these otherwise incurable wounds. Kryptonite-rich gas can significantly reduce a Kryptonian's strength, durability, resilience and mobility, causing them to move as slow as a normal human, to lose their flight and enhanced sensory abilities, as well as to be weakened enough to be incapacitated by physical attacks by someone as strong as Batman in his Armored Batsuit (only 28 times stronger than a human[6]).

Despite kryptonite gas' effects only lasting a few minutes at most, the weakening effects can still linger briefly, with it therefore taking a few more minutes for a Kryptonian to fully regain his/her superpowers.


  • In DC Comics, Superman entrusted Batman with kryptonite, in order to ensure that the latter would use it should the Man of Steel ever go rogue.
  • In most DC Comics iterations since 1986's The Man of Steel mini-series, kryptonite can cause cancer in humans after very prolonged exposure to the element, but also can be used as a near infinite power source.
  • In DC Comics, kryptonite comes in a variety of colors, and each affects a super-powered Kryptonian in different ways, with red being the most random.
  • The Flash Ultimate Figure Set made by Spin Master has several items that the characters can use, including kryptonite. However, kryptonite never appears or is mentioned in the film.


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